| Afghanistan | Leadership Council of Afghanistan (رهبری شُورَىٰ, Rahbarī Shūrā) | Unicameral | No fixed term | Appointment by the supreme leader | Aprx.30 | 1,340,608 |
| Albania | Parliament of Albania (Kuvendi i Shqipërisë) | Unicameral | 4 | Closed list proportional representation with the D'Hondt method by county with a 3% threshold | 140 | 20,226 |
| Algeria | Parliament of Algeria (البرلمان الجزائري, Barlaman al-Jazā'ir / Agraw Azzayri / Parlement algérien) | People's National Assembly (المجلس الشعبي الوطني, al-Majlis al-Sha'abi al-Watani / Asqamu Aɣerfan Aɣelnaw / Assemblée populaire nationale, APN) | Lower | 5 | Open list proportional representation with the largest remainder method by province | 407 | 80,303 |
| Council of the Nation (مجلس الأمة, Majlis al-Ummah / Conseil de la nation) | Upper | 6 | Elected by popular wilaya assemblies and communal people's assemblies, and appointed by the President | 174 | 257,638 |
| Andorra | General Council of Andorra (Consell General d'Andorra) | Unicameral | 4 | Parallel voting: Closed list proportional representation with the largest remainder method nationwide and block vote by parish | 28 | 2,789 |
| Angola | National Assembly (Assembleia Nacional) | Unicameral | 4 | Closed list proportional representation with the D'Hondt method nationwide and by province | 220 | 84,081 |
| Antigua and Barbuda | Parliament of Antigua and Barbuda | House of Representatives | Lower | 5 | First-past-the-post | 17 | 4,305 |
| Senate | Upper | 5 | Appointed by the governor-general, representing the monarch, on the advice of the prime minister and leader of the Opposition | 17 | 4,811 |
| Argentina | National Congress of Argentina (Congreso de la Nación Argentina) | Chamber of Deputies of the Nation (Cámara de Diputados de la Nación) | Lower | 4 | Closed list proportional representation with the D'Hondt method by province with a 3% threshold | 257 | 156,097 |
| Honorable Senate of the Nation (Honorable Senado de la Nación Argentina) | Upper | 6 | Partial block voting by province | 72 | 557,181 |
| Armenia | National Assembly of Armenia (Հայաստանի Հանրապետության Ազգային ժողով, Hayastani Hanrapetyut'yan Azgayin zhoghov / Abbreviated: Ազգային ժողով, ԱԺ, Azgayin Zhoghov, AZh) Informal: Parliament of Armenia (խորհրդարան, Khorhrdaran) | Unicameral | 5 | Closed-list proportional representation in a nationwide constituency and open-list proportional in district constituencies, with a 5% or top-3 national threshold (or 7% for alliances) | 105 | 24,902 |
| Australia | Parliament of Australia | House of Representatives | Lower | 3 | Instant-runoff voting | 150 | 162,914 |
| Senate | Upper | 6 (for states) 3 (for territories) unless elections are called earlier | Single transferable vote by state/territory, usually, 6 seats from each state and all territory seats are up for election (40 total) except in the case of a double dissolution, when all seats are up for election | 76 | 323,684 |
| Austria | Austrian Parliament (Österreichisches Parlament) | National Council (Nationalrat) | Lower | 5 | Open list proportional representation with the D'Hondt method in constituencies with a 4% threshold | 183 | 43,895 |
| Federal Council (Bundesrat) | Upper | 5 and 6 | Elected by state legislatures | 60 | 129,563 |
| Azerbaijan | National Assembly (Milli Məclis) | Unicameral | 5 | First-past-the-post | 125 | 73,320 |
| Bahamas | Parliament of the Bahamas | House of Assembly | Lower | 5 | First-past-the-post | 39 | 9,326 |
| Senate | Upper | 5 | Appointed by the governor-general, representing the monarch, on the advice of the prime minister and leader of the Opposition | 16 | 22,103 |
| Bahrain | National Assembly (المجلس الوطني البحريني, Al-majlis al-wataniu al-bahrayniu) | Council of Representatives (مجلس النواب, Majlis an-nuwab) | Lower | 4 | Two-round system | 40 | 30,864 |
| Consultative Council (مجلس الشورى, Majlis al-shura) | Upper | 4 | Appointed by the king | 40 | 30,864 |
| Bangladesh | Jatiya Sangsad (জাতীয় সংসদ) | Unicameral | 5 | First-past-the-post | 350 | 466,909 |
| Barbados | Parliament of Barbados | House of Assembly | Lower | 5 | First-past-the-post | 30 | 9,486 |
| Senate | Upper | 5 | Appointed by the President on the advice of the prime minister and leader of the Opposition | 21 | 13,551 |
| Belarus | National Assembly of the Republic of Belarus (Нацыянальны сход Рэспублікі Беларусь, Nacyjanalny schod Respubliki Bielaruś / Национальное собрание Республики Беларусь, Natsionalnoye sobran'ye Respubliki Belarus) | House of Representatives (Палата прадстаўнікоў, Palata pradstaŭnikoŭ / Палата представителей, Palata predstavitelej) | Lower | 5 | Two-round system | 110 | 85,997 |
| Council of the Republic (Савет Рэспублікі, Saviet Respubliki / Совет Республики) | Upper | 5 | Elected by regional councils, and appointed by the President | 64 | 147,773 |
| Belgium | Federal Parliament (Federaal Parlement / Parlement fédéral / Föderales Parlament) | Chamber of Representatives (Kamer van Volksvertegenwoordigers / Chambre des Représentants / Abgeordnetenkammer) | Lower | 5 | Open list proportional representation with the D'Hondt method by province with a 5% threshold | 150 | 74,000 |
| Senate (Senaat / Sénat / Senat) | Upper | 5 | Elected by community and regional parliaments | 60 | 185,000 |
| Belize | National Assembly | House of Representatives | Lower | 5 | First-past-the-post | 31 | 10,748 |
| Senate | Upper | 5 | Appointed by the governor-general representing the monarch, on the advice of the prime minister and leader of the Opposition | 12 | 27,766 |
| Benin | National Assembly (Assemblée nationale) | Unicameral | 4 | Proportional representation with the largest remainder method in constituencies | 83 | 115,648 |
| Bhutan | Parliament of Bhutan (རྒྱལ་ཡོངས་ཚོགས་ཁང་, Gyelyong Tshokhang) | National Assembly (རྒྱལ་ཡོངས་ཚོགས་འདུ།, Gyelyong Tshogdu) | Lower | 5 | First-past-the-post | 47 | 15,072 |
| National Council (རྒྱལ་ཡོངས་ཚོགས་སྡེ།, Gyelyong Tshogde) | Upper | 4 | First-past-the-post, and appointed by the king | 25 | 28,337 |
| Bolivia | Plurinational Legislative Assembly (Asamblea Legislativa Plurinacional) | Chamber of Deputies (Cámara de Diputados) | Lower | 5 | Closed list mixed-member proportional representation: Proportional representation with the D'Hondt method by department and first-past-the-post | 130 | 83,905 |
| Chamber of Senators (Cámara de Senadores) | Upper | 5 | Closed list proportional representation with the D'Hondt method by department | 36 | 302,993 |
| Bosnia and Herzegovina | Parliamentary Assembly (Parlamentarna skupština / Парламентарна скупштина) | House of Representatives (Predstavnički dom/ Zastupnički dom / Представнички дом) | Lower | 4 | Open list proportional representation with the largest remainder method in constituencies | 42 | 91,422 |
| House of Peoples (Dom naroda / Дом народa) | Upper | 4 | Serbs elected by the National Assembly of Republika Srpska, and Bosniaks and Croats elected by the House of Peoples of the Federation of Bosnia and Herzegovina | 15 | 255,982 |
| Botswana | Parliament of Botswana | National Assembly (Palamente ya Botswana) | Unicameral | 5 | First-past-the-post, and appointed by the President | 69 | 32,211 |
| Brazil | National Congress (Congresso Nacional) | Chamber of Deputies (Câmara dos Deputados) | Lower | 4 | Open list proportional representation with the D'Hondt method by state | 513 | 371,798 |
| Federal Senate (Senado Federal) | Upper | 8 | Partial block voting by state | 81 | 2,354,724 |
| Brunei | Legislative Council (Majlis Mesyuarat Negara) | Unicameral | no timeframe | Appointed by the Sultan | 36 | 11,355 |
| Bulgaria | National Assembly (Народно събрание, Narodno sabranie) | Unicameral | 4 | Closed list proportional representation with the largest remainder method by constituency with a 4% threshold | 240 | 30,685 |
| Burkina Faso | National Assembly (Assemblée nationale) | Unicameral | 5 | Proportional representation with the D'Hondt method nationwide and in constituencies | 127 | 126,281 |
| Burundi | Parliament (Parlement) | National Assembly (Inama nshingamateka/ Assemblée nationale) | Lower | 5 | Closed list proportional representation with the D'Hondt method in constituencies with a 2% threshold | 121 | 74,570 |
| Senate (Inama nkenguzamateka/ Sénat) | Upper | 5 | Elected by the communal councils | 43 | 179,577 |
| Cambodia | Parliament (សភាតំណាងរាស្ត្រ, Sâphéa Tâmnang Réastr) | National Assembly (រដ្ឋសភា, Rôdthsâphéa) | Lower | 5 | Closed list proportional representation with the D'Hondt method by province | 123 | 108,852 |
| Senate (ព្រឹទ្ធសភា, Prœ̆tthsâphéa) | Upper | 6 | Appointed by the monarch, elected by the National Assembly and commune councils | 61 | 219,490 |
| Cameroon | Parliament (Parlement) | National Assembly (Assemblée nationale) | Lower | 5 | First-past-the-post and Block vote: If no list obtains an absolute majority, the one with the highest number of votes is allocated half of the seats; the remainder is allocated to the other best-placed lists through proportional representation | 180 | 97,021 |
| Senate (Sénat) | Upper | 5 | Elected by municipal councils, and appointed by the president | 100 | 174,638 |
| Canada | Parliament (Parlement) | House of Commons (Chambre des communes) | Lower | 4 years, unless elections are called earlier | First-past-the-post voting | 338 | 104,571 |
| Senate (Sénat) | Upper | Until age 75, or resignation. | Appointed by the governor general, representing the monarch, on the advice of the prime minister | 105 | 318,825 |
| Cape Verde | National Assembly (Asembleia Nacional) | Unicameral | 5 | Closed list proportional representation with the D'Hondt method in constituencies | 72 | 4,990 |
| Central African Republic | National Assembly (Assemblée nationale) | Unicameral | 5 | Two-round system | 131 | 38,951 |
| Chad | National Assembly (Assemblée nationale / الجمعية الوطنية, aljameiat alwatania) | Unicameral | 4 | Block voting: If no list obtains an absolute majority, the seats are allocated through proportional representation | 188 | 66,640 |
| Chile | National Congress (Congreso Nacional) | Chamber of Deputies (Cámara de Diputados) | Lower | 4 | Open list proportional representation with the D'Hondt method | 155 | 145,021 |
| Senate of the Republic (Senado de la República) | Upper | 8 | Open list proportional representation with the D'Hondt method | 50 | 457,963 |
| China | National People's Congress (全国人民代表大会, Quánguó Rénmín Dàibiǎo Dàhuì) | Unicameral | 5 | Elected by municipal, regional and provincial congresses, and People's Liberation Army | 2,980 | 448,518 |
| Colombia | Congress (Congreso) | Chamber of Representatives (Cámara de Representantes) | Lower | 4 | Open or closed list proportional representation (depending on the political party) with the D'Hondt method by state | 166 | 279,556 |
| Senate (Senado) | Upper | 4 | Open or closed list proportional representation (depending on the political party) with the D'Hondt method nationwide with a 3% threshold | 102 | 454,964 |
| Comoros | Assembly of the Union (Assemblée de l'Union) | Unicameral | 5 | Two-round system, and elected by the local assemblies | 33 | 24,181 |
| Congo | Parliament (Parlement) | National Assembly (Assemblée nationale) | Lower | 5 | Two-round system | 151 | 28,537 |
| Senate (Sénat) | Upper | 5 | Elected by district, local, and regional councils | 52 | 83,966 |
| Costa Rica | Legislative Assembly (Asamblea Legislativa) | Unicameral | 4 | Closed list proportional representation with the largest remainder method by province | 57 | 75,468 |
| Croatia | Croatian Parliament (Hrvatski sabor) | Unicameral | 4 | Open list proportional representation with the D'Hondt method in constituencies with a 5% threshold | 151 | 28,414 |
| Cuba | National Assembly of People's Power (Asamblea Nacional del Poder Popular) | Unicameral | 5 | Popular vote and approval by special candidacy commissions | 605 | 18,308 |
| Cyprus | House of Representatives (Βουλή των Αντιπροσώπων, Vouli Antiprosópon / Temsilciler Meclisi) | Unicameral | 5 | Open list proportional representation with the largest remainder method by constituency | 56 | 18,632 |
| Czech Republic | Parliament of the Czech Republic (Parlament České republiky) | Chamber of Deputies (Poslanecká sněmovna) | Lower | 4 | Open list proportional representation with the D'Hondt method by region with a 5% threshold | 200 | 52,811 |
| Senate (Senát) | Upper | 6 | Two-round system (staggered elections) | 81 | 130,397 |
| Denmark | Folketing | Unicameral | 4 | Open list proportional representation with the D'Hondt method in constituencies with a 2% threshold including the Faroe Islands and Greenland seats | 179 | 30,969 |
| Djibouti | National Assembly (Assemblée nationale / الجمعية الوطنية, aljameiat alwatania) | Unicameral | 5 | Block vote and closed list proportional representation by constituencies: The list obtaining an absolute or relative majority of votes is allocated 80% of the seats; the remainder is allocated to the other best-placed lists which obtained at least 10% of the valid votes through proportional representation; if no other list obtains 10% of the valid votes, the remaining seats will be allocated to the party which won the majority or relative majority of the valid votes | 65 | 12,587 |
| Dominica | House of Assembly | Unicameral | 5 | First-past-the-post voting, and appointed by the President | 32 | 3,394 |
| Dominican Republic | National Congress (Congreso Nacional) | Chamber of Deputies (Cámara de Diputados) | Lower | 4 | Open list proportional representation with the D'Hondt method by province and nationwide with a 1% threshold for the nationwide seats | 190 | 51,520 |
| Senate (Senado) | Upper | 4 | First-past-the-post voting | 32 | 293,088 |
| DR Congo | Parliament (Parlement) | National Assembly (Assemblée nationale) | Lower | 5 | Coexistence: Open list proportional representation with the largest remainder method in multi-member constituencies and first-past-the-post voting in single-member constituencies | 500 | 143,425 |
| Senate (Sénat) | Upper | 5 | Elected by the provincial assemblies | 108 | 664,008 |
| East Timor | National Parliament (Parlamentu Nasionál / Parlamento Nacional) | Unicameral | 5 | Closed list proportional representation with the D'Hondt method nationwide with a 3% threshold | 65 | 16,408 |
| Ecuador | National Assembly (Asamblea Nacional) | Unicameral | 4 | Closed list proportional representation in multi-member constituencies and Closed list proportional representation in a single nationwide constituency | 151 | 115,783 |
| Egypt | Parliament (برلمان, Barlaman) | Senate (مجلس الشيوخ, Majlis Alshuyukh) | Upper | 5 | | 300 | 375,722 |
| House of Representatives (مجلس النواب, Majilis Al-Nuwab) | Lower | 5 | Parallel voting: First-past-the-post voting, block vote, and appointed by the President | 596 | 150,983 |
| El Salvador | Legislative Assembly (Asamblea Legislativa) | Unicameral | 3 | Open list proportional representation with the D'Hondt method by department | 60 | 95,735 |
| Equatorial Guinea | Parliament (Parlamento / Parlement / Parlamento) | Chamber of Deputies (Cámara de los Diputados / Chambre des députés / Câmara dos Deputados) | Lower | 5 | Closed list proportional representation in constituencies with a 10% threshold | 100 | 16,220 |
| Senate (Senado / Sénat / Senado) | Upper | | Closed list proportional representation with a 10% threshold, and appointed by the President | 70 | 23,171 |
| Eritrea | National Assembly (ሃገራዊ ባይቶ, Hagerawi Baito) | Unicameral | 5 | Popular vote | 104 | 50,878 |
| Estonia | Riigikogu | Unicameral | 4 | Open list proportional representation with the D'Hondt method in constituencies with a 5% threshold | 101 | 12,814 |
| Eswatini | Parliament (Liblanda) | House of Assembly (Indlu yeMalunga) | Lower | 5 | majority | 55 | 22,181 |
| Senate (Indlu yeTimphunga) | Upper | 5 | Appointed by the King | 30 | 40,666 |
| Ethiopia | Parliament (የፌዴራል ፓርላማ ምክር ቤት, Ye-Fēdēralawī Parilama Mikir Bēt) | House of Peoples' Representatives (የሕዝብ ተወካዮች ምክር ቤት, Ye-Hizib Tewekayochi Mikir Bē) | Lower | 5 | First-past-the-post voting | 547 | 135,134 |
| House of Federation (የፌዴሬሽን ምክር ቤት, Ye-Fēdērēshin Mikir Bēt) | Upper | 5 | Elected by State Councils | 112 | 659,986 |
| Federated States of Micronesia | Congress | Unicameral | 4 | First-past-the-post voting | 14 | 7,642 |
| Fiji | Parliament | Unicameral | 4 | Open list proportional representation with the D'Hondt method nationwide with a 5% threshold | 50 | 16,745 |
| Finland | Parliament (Eduskunta / Riksdagen) | Unicameral | 4 | Open list proportional representation with the D'Hondt method in constituencies, and first-past-the-post for Åland's lone seat | 200 | 25,900 |
| France | Parliament (Parlement) | National Assembly (Assemblée nationale) | Lower | 5 | Two-round system | 577 | 113,258 |
| Senate (Sénat) | Upper | 6 | Elected indirectly by officials including regional councilors, department councilors, mayors, city councilors, and members of the National Assembly; two-round or proportional by department depending on the number of seats. | 348 | 187,787 |
| Gabon | Parliament (Parlement) | National Assembly (Assemblée nationale) | Lower | 5 | First-past-the-post voting, and appointed by the President | 121 | 12,190 |
| Senate (Sénat) | Upper | 6 | Indirectly elected by local and départemental councillors | 102 | 14,460 |
| Gambia | National Assembly | Unicameral | 5 | First-past-the-post voting, and appointed by the President | 58 | 25,673 |
| Georgia | Parliament of Georgia (საქართველოს პარლამენტი, Sak'art'velos Parlamenti) | Unicameral | 4 | Closed list proportional representation in a nationwide constituency with a 5% threshold | 150 | 29,794 |
| Germany | Bundestag | Lower | 4 | Closed list mixed-member proportional representation with the Sainte-Laguë method by state with a 5% threshold, and first-past-the-post | 630 | 132,662 |
| German Bundesrat | Upper | Dependent on individual state elections | Delegated from state governments | 69 | 1,185,501 |
| Ghana | Parliament | Unicameral | 4 | First-past-the-post voting | 276 | 106,286 |
| Greece | Hellenic Parliament (Βουλή των Ελλήνων, Vouli ton Ellinon) | Unicameral | 4 | Open list reinforced proportional representation with the D'Hondt method in constituencies with a 3% threshold | 300 | 35,958 |
| Grenada | Parliament | House of Representatives | Lower | 5 | First-past-the-post voting | 15 | 7,333 |
| Senate | Upper | 5 | Appointed by the government and by the leader of opposition | 13 | 8,461 |
| Guatemala | Congress of the Republic (Congreso de la República) | Unicameral | 4 | proportional closed list | 160 | 80,557 |
| Guinea | National Assembly (Assemblée nationale) | Unicameral | 5 | proportional closed list | 114 | 88,227 |
| Guinea-Bissau | National People's Assembly (Assembleia Nacional Popular) | Unicameral | 4 | proportional closed list | 100 | 13,454 |
| Guyana | National Assembly | Unicameral | 5 | popular vote and appointed by the President | 65 | 11,583 |
| Haiti | National Assembly (Assemblée nationale / Asanble Nasyonal) | Chamber of Deputies (Chambre des députés / Chanm Depite) | Lower | 4 | proportional | 119 | 98,181 |
| Senate (Sénat / Sena) | Upper | 6 | | 30 | 323,997 |
| Honduras | National Congress (Congreso Nacional) | Unicameral | 4 | proportional open list | 128 | 58,823 |
| Hungary | National Assembly (Országgyűlés) | Unicameral | 4 | proportional open list and Scorporo | 199 | 25,860 |
| Iceland | Althing (Alþingi) | Unicameral | 4 | proportional | 63 | 5,080 |
| India | Parliament (संसद, Sansad) | Lok Sabha | Lower | 5 | First-past-the-post | 543 | 2,192,379 |
| Rajya Sabha (राज्य सभा | Upper | 6 | Single transferable vote (233 members are elected by the legislative assemblies of the States/Union territories, 12 members are nominated by the President) | 245 | 4,847,900 |
| Indonesia | People's Consultative Assembly (Majelis Permusyawaratan Rakyat) | People's Representative Council (Dewan Perwakilan Rakyat) | Lower | 5 | proportional open list | 575 | 467,101 |
| Regional Representative Council (Dewan Perwakilan Daerah) | Upper | 5 | Single non-transferable vote | 136 | 1,974,875 |
| Iran | Islamic Consultative Assembly (مجلس شورای اسلامی, Majles-e Showrā-ye Eslāmī) | Unicameral | 4 | popular vote | 290 | 259,136 |
| Iraq | Council of Representatives of Iraq (مجلس النواب العراقي, Majlis Al-Niwab Al-Iraqi / ئهنجومهنی نوێنهران, Enjumen-e Nûnerên) | Unicameral | 4 | proportional open list | 329 | 95,782 |
| Ireland | Oireachtas | President of Ireland (Uachtarán) | President-in-Parliament | 7 | Instant-runoff voting | N/A | N/A |
| Dáil Éireann | Lower | 5 | Proportional Representation Single Transferable Vote | 174 | 31,371 |
| Seanad Éireann | Upper | 5 | Appointed by the prime minister, elected by local and national elected representatives, and elected by graduates of universities | 60 | 76,470 |
| Israel | Knesset (כנסת, Knesset) | Unicameral | 4 | proportional closed list | 120 | 61,768 |
| Italy | Parliament (Parlamento) | Chamber of Deputies (Camera dei Deputati) | Lower | 5 | parallel voting (245 seats by proportional representation, 147 seats by first past the post and 8 abroad by proportional representation) | 400 | 152,738 |
| Senate of the Republic (Senato della Repubblica) | Upper | 5 | parallel voting (122 seats by proportional representation, 74 seats by first past the post and 4 abroad by proportional representation), 5 members appointed by the President and former Presidents by right | 200 | 296,580 |
| Ivory Coast | Parliament (Parlement) | National Assembly (Assemblée nationale) | Lower | 5 | majority | 255 | 123,529 |
| Senate (Sénat) | Upper | 5 | Elected by district and provincial councils, and appointed by the President | 120 | 262,500 |
| Jamaica | Parliament | House of Representatives | Lower | 5 | First-past-the-post voting | 63 | 45,860 |
| Senate | Upper | 5 | Appointed by the governor-general | 21 | 137,580 |
| Japan | Diet (国会, Kokkai) | House of Representatives (衆議院, shūgiin) | Lower | 4 | proportional and First-past-the-post voting | 465 | 270,817 |
| House of Councillors (参議院, Sangiin) | Upper | 6 | proportional and Single non-transferable vote | 248 | 514,000 |
| Jordan | Parliament (مجلس الأمة, Majlis al-Umma) | House of Representatives (مجلس النواب, Majlis al-Nuwaab) | Lower | 4 | Single non-transferable vote | 138 | 46,760 |
| Senate (مجلس الأعيان, Majlis al-Aayan) | Upper | 6 | Appointed by the monarch | 75 | 93,520 |
| Kazakhstan | Parliament (Парламент, Parlament) | Assembly (Мәжіліс, Mäjilis) | Lower | 5 | | 107 | 207,854 |
| Senate (Сенат, Senat) | Upper | 6 | Appointed by the President and elected by local assemblies | 49 | 340,527 |
| Kenya | Parliament (Bunge) | National Assembly (Bunge la Taifa) | Lower | 5 | parallel | 349 | 126,182 |
| Senate (Seneti) | Upper | 5 | Popular vote and appointed by the President | 67 | 657,278 |
| Kiribati | House of Assembly (Maneaba ni Maungatabu) | Unicameral | 4 | popular vote and appointed by Rabi Council of Leaders | 46 | 2,239 |
| Kuwait | National Assembly (مجلس الأمة, Majlis al-Umma) | Unicameral | 4 | popular vote and appointed by the emir | 50 | 71,328 |
| Kyrgyzstan | Supreme Council (Жогорку Кеңеш, Joğorku Keñeş) | Unicameral | 5 | popular vote | 90 | 44,690 |
| Laos | National Assembly (ສະພາແຫ່ງຊາດ, Sapha Aehngsad) | Unicameral | 5 | one-party state closed list | 115 | 48,148 |
| Latvia | Saeima | Unicameral | 4 | proportional closed list | 100 | 20,703 |
| Lebanon | Parliament (مجلس النواب, Majlis an-Nuwwab / Chambre des Députés) Also: National Assembly (Assemblée nationale) | Unicameral | 4 | proportional party list | 128 | 33,000 |
| Lesotho | Parliament (Palamente ea Lesotho) | National Assembly (Lekhotleng la Sechaba) | Lower | 5 | popular vote and proportional | 120 | 16,927 |
| Senate (Ntlong ea Mahosana) | Upper | 5 | appointed by principal chiefs and by the ruling party | 33 | 61,556 |
| Liberia | Legislature | House of Representatives | Lower | 6 | majority | 73 | 47,624 |
| Senate | Upper | 9 | majority | 30 | 115,896 |
| Libya | House of Representatives (مجلس النواب, Majlis an-Nuwwab) | Unicameral | | Parallel voting: First-past-the-post, single non-transferable vote, and proportional representation | 200 | 28,353 |
| Liechtenstein | Landtag | Unicameral | 4 | proportional closed list | 25 | 1,451 |
| Lithuania | Seimas | Unicameral | 4 | proportional | 141 | 21,658 |
| Luxembourg | Chamber of Deputies (D'Chamber / Chambre des députés / Abgeordnetenkammer) | Unicameral | 5 | Open list proportional representation, allocated by the D'Hondt method in four constituencies | 60 | 11,013 |
| Madagascar | Parliament (Palemanta / Parlement) | National Assembly (Antenimieram-Pirenena / Assemblée nationale) | Lower | 5 | Parallel voting | 160 | 137,078 |
| Senate (Antenimierandoholona / Sénat) | Upper | 5 | | 33 | 664,430 |
| Malawi | National Assembly | Unicameral | 5 | First-past-the-post voting | 193 | 76,809 |
| Malaysia | Parliament (Parlimen) | Dewan Rakyat | Lower | 5 | First-past-the-post voting | 222 | 127,631 |
| Dewan Negara | Upper | 3 | 26 appointed by the State Legislative Assemblies, 2 for each state and 44 appointed by the Yang di-Pertuan Agong, of which 4 are for the Federal Territories. | 70 | 404,773 |
| Maldives | People's Majlis (ރައްޔިތުންގެ މަޖިލިސް, Rayyithunge Majilis) | Unicameral | 5 | First-past-the-post voting | 85 | 4,266 |
| Mali | National Assembly (Assemblée nationale) | Unicameral | 4 | 147 elected in single or multi-member constituencies, using a runoff system. 13 elected by overseas Malians. | 160 | 90,732 |
| Malta | Parliament (Il-Parlament) | President of Malta | President-in-Parliament | 5 | Appointed by the House of Representatives | N/A | N/A |
| House of Representatives (Kamra tad-Deputati) | Unicameral | 5 | Single transferable vote | 69 | 5,950 |
| Marshall Islands | Legislature (Nitijeļā) | Unicameral | 4 | Single and multi-member constituencies | 33 | 2,060 |
| Mauritania | Parliament (البرلمان, al-Barlamān / Parlement) | National Assembly (الجمعية الوطنية, al-Jamʻīyah al-Waṭanīyah / 𞤀𞤧𞤢𞥄𞤥𞤦𞤫𞤤𞤫 𞤲𞤺𞤫𞤲𞤲𞤣𞤭, Asaambele ngenndi / Assemblée nationale) | Unicameral | 5 | Parallel voting: 50% seats elected via closed list proportional representation with the largest remainder method across three national lists and some urban districts, 50% elected via a general ticket with a two-round system by electoral district | 176 | N/A |
| Mauritius | National Assembly (Assemblée nationale) | Unicameral | 5 | | 65 | 17,614 |
| Mexico | Congress of the Union (Congreso de la Unión) | Chamber of Deputies (Cámara de Diputados) | Lower | 3 | Parallel voting: Largest remainder method (Hare quota) (200 seats) / FPTP (300 seats) | 500 | 227,821 |
| Chamber of Senators (Cámara de Senadores) | Upper | 6 | Parallel voting: Largest remainder method (Hare quota) | 128 | 889,926 |
| Moldova | Parliament (Parlamentul) | Unicameral | 4 | Closed list proportional representation | 101 | 33,498 |
| Monaco | National Council (Conseil National) | Unicameral | 5 | Panachage under party-list proportional representation (16), party-list proportional representation (8) | 24 | 1,473 |
| Mongolia | State Great Khural (Улсын Их Хурал, Ulsyn Ikh Khural) | Unicameral | 4 | Plurality-at-large voting | 126 | 36,245 |
| Montenegro | Assembly (Skupština, Скупштина) | Unicameral | 4 | Closed list proportional representation using the D'Hondt method in a single nationwide constituency with a 3% electoral threshold with lower thresholds for minority groups under certain circumstances | 81 | 7,719 |
| Morocco | Parliament (البرلمان المغربي, Barlaman almaghrib / ⴰⴱⵕⵍⴰⵎⴰⵏ ⴰⵎⵖⵔⵉⴱⵉ / Parlement) | House of Representatives (مجلس النواب, Majlis al-Nuwab / ⴰⴳⵔⴰⵡ ⵉⵎⴰⵔⴰⵢⴻⵏ, Asqqim n Imura / Chambre des représentants) | Lower | 5 | Mixed member majoritarian: Single non-transferable vote for 305 seats, 60 seats reserved for women and 30 seats reserved for young people under 40 by proportional representation | 395 | 100,444 |
| House of Councillors (مجلس المستشارين, Majlis al-Mustasharin / ⴰⵙⵇⵇⵉⵎ ⵏ ⵉⵏⵙⴼⴰⵡⵏ, Asqqim n Insfawn / Chambre des conseillers) | Upper | 6 | Indirect election: 72 members are elected at the Kingdom's regional level, 20 in each region by a single electoral college made up of all those in the relevant region that have been elected to specific professional associations, 8 in each region by an electoral college made up of those elected from the most representative employers' professional organizations, 20 by a nationwide electoral college made up of employees | 270 | 120,905 |
| Mozambique | Assembly of the Republic (Assembleia da República) | Unicameral | 5 | proportional party list | 250 | 85,588 |
| Myanmar (Burma) | Pyidaungsu Hluttaw (ပြည်ထောင်စုလွှတ်တော်, Pyidaungsu Hluttaw) | Pyithu Hluttaw (ပြည်သူ့လွှတ်တော်, Pyithu Hluttaw) | Lower | 5 | popular vote and appointed by the military | 440 | 137,000 |
| Amyotha Hluttaw (အမျိုးသားလွှတ်တော် | Upper | 5 | popular vote and appointed by the military | 224 | 269,107 |
| Namibia | Parliament | National Assembly | Lower | 5 | Closed list proportional representation and appointments by the President | 104 | 26,923 |
| National Council | Upper | 6 | Indirect election by Regional Councils | 26 | 80,769 |
| Nauru | Parliament (Naoero parliament) | Unicameral | 3 | Dowdall system | 19 | 521 |
| Nepal | Federal Parliament (संघीय संसद, Sanghiya Sansad) | House of Representatives (प्रतिनिधि सभा, Pratinidi Sabha) | Lower | 5 | Mixed member majoritarian (165 members elected through First-past-the-post voting and 110 elected through proportional representation voting method) | 275 | 105,392 |
| National Assembly (राष्ट्रिय सभा, Rastriya Sabha) | Upper | 6 | Indirect single transferable vote and 3 members appointed by the President | 59 | 491,233 |
| Netherlands | States General (Staten-Generaal) | House of Representatives (Tweede Kamer, lit.'Second Chamber') | Lower | 4 | Party-list proportional representation | 150 | 111,533 |
| Senate (Eerste Kamer, lit.'First Chamber') | Upper | 4 | Indirect party-list proportional (by members of the states-provincial and the Caribbean Electoral colleges for the Senate) | 75 | 223,066 |
| New Zealand | Parliament (Pāremata) | House of Representatives (Whare o ngā Māngai) | Unicameral | 3 | Closed list mixed-member proportional representation with a 5% threshold | 120 | 33,566 |
| Nicaragua | National Assembly (Asamblea Nacional) | Unicameral | 5 | Party-list proportional representation | 90 | 64,034 |
| Niger | National Assembly (Assemblée nationale) | Unicameral | 5 | Proportional representation | 171 | 139,210 |
| Nigeria | National Assembly | House of Representatives | Lower | 4 | | 360 | 388,898 |
| Senate | Upper | 4 | | 109 | 1,284,436 |
| North Korea | Supreme People's Assembly (최고인민회의 / 最高人民會議, Ch'oe-go In-min Hoe-ŭi) | Unicameral | 5 | popular vote | 687 | 36,390 |
| North Macedonia | Assembly (Собрание, Sobranie) | Unicameral | 4 | Proportional representation (D'Hondt method) | 120 | 16,736 |
| Norway | Storting | Unicameral | 4 | proportional mixed | 169 | 29,785 |
| Oman | Council of Oman (مجلس عُـمان, Majlis euman) | Consultative Assembly (مجلس الشورى, Majlis al-Shura) | Lower | 4 | | 84 | 33,017 |
| Council of State (مجلس الدولة, Majlis al-Dawla) | Upper | 4 | | 85 | 32,628 |
| Pakistan | Parliament of Pakistan (پارلیمنٹ, Pārlīmān Pākistān or مجلسِ شوریٰ پاکستان, Majlis-e-Shūrā Pākistān, lit.'Consultative Assembly of Pakistan') | National Assembly of Pakistan (قومی اسمبلی پاکستان, ایوان زیریں, Aiwān-e-Zairīñ, lit.'Lower house') | Lower | 5 | General Seats through direct First-past-the-post voting and Proportional representation to Political parties as per their seats in the house for Reserved Seats for Women and Minorities. | 336 | 768,095 |
| Senate (سینیٹ پاکستان, ایوانِ بالا, Aiwān-e-Bālā, lit.'Upper house') | Upper | 6 | Indirect single transferable vote | 96 | 2,688,333 |
| Palau | National Congress (Olbiil era Kelulau) | House of Delegates | Lower | 4 | majority | 16 | 1,309 |
| Senate | Upper | 4 | majority | 13 | 2,328 |
| Palestine | Legislative Council (المجلس التشريعي, Al-Majlis al-Tashrī'iyy) | Unicameral | | Parallel additional member system | 132 | 32,277 |
| Panama | National Assembly (Asamblea Nacional) | Unicameral | 5 | First-past-the-post voting in outlying rural districts and party-list proportional representation in cities | 71 | 47,969 |
| Papua New Guinea | National Parliament | Unicameral | 5 | Limited instant-runoff voting | 109 | 56,766 |
| Paraguay | Congress (Congreso) | Chamber of Deputies (Cámara de Diputados) | Lower | 5 | | 80 | 80,681 |
| Chamber of Senators (Cámara de Senadores) | Upper | 5 | | 45 | 143,434 |
| Peru | Congress of the Republic (Congreso de la República / Rimana Wasin) | Unicameral | 5 | Constituencies using proportional representation with a 5% threshold | 130 | 217,082 |
| Philippines | Congress (Kongreso) | House of Representatives (Kapulungan ng mga Kinatawan or Mababang Kapulungan, lit.'Lower house' / Cámara de Representantes) | Lower | 3 | Parallel voting: Largest remainder method via closed lists with a three-seat cap (20% of seats), and first-past-the-post voting (80% of seats) | 304 | 341,364 |
| Senate (Senado or Mataas na Kapulungan, lit.'Upper house') | Upper | 6 | bloc voting. Voter is allocated 12 votes. 1/2 of the seats are contested every 3 years with the 12 elected senators having the largest portion of the National Popular Vote | 24 | 4,323,958 |
| Poland | Parliament of Poland (Parlament) National Assembly (Zgromadzenie Narodowe) | Sejm (Sejm) | Lower | 4 | proportional open list | 460 | 83,697 |
| Senate (Senat) | Upper | 4 | majority | 100 | 385,010 |
| Portugal | Assembly of the Republic (Assembleia da República) | Unicameral | 4 | proportional party list | 230 | 45,920 |
| Qatar | Consultative Assembly (مجلس الشورى, Majlis ash-Shura) | Unicameral | | | 35 | 52,958 |
| Romania | Parliament (Parlamentul) | Chamber of Deputies (Camera Deputaților) | Lower | 4 | | 329 | 58,416 |
| Senate (Senat) | Upper | 4 | | 137 | 139,005 |
| Russia | Federal Assembly (Федеральное Собрание, Federalnoye Sobraniye) | State Duma (Государственная Дума, Gosudarstvennaya Duma) | Lower | 5 | parallel (First-past-the-post voting for 225 members and proportional party list for 225 members) | 450 | 318,000 |
| Federation Council (Совет Федерации, Sovet Federatsii) | Upper | dependent on individual elections in the federal subjects (4 or 5) | senators are delegated from the executive and legislative bodies of the federal subjects | 170 | 862,048 |
| Rwanda | Parliament (Inteko Ishinga Amategeko / Parlement) | Chamber of Deputies (Umutwe w'Abadepite / Chambre des députés) | Lower | 5 | Closed party list (53 seats) and indirect election (27 seats) | 80 | 146,121 |
| Senate (Umutwe wa Sena / Sénat) | Upper | 8 | | 26 | 449,603 |
| Saint Kitts and Nevis | National Assembly | Unicameral | 5 | First-past-the-post | 15 | 3,686 |
| Saint Lucia | Parliament | House of Assembly | Lower | 5 | | 17 | 10,221 |
| Senate | Upper | | | 11 | 15,796 |
| Saint Vincent and the Grenadines | House of Assembly | Unicameral | 5 | | 21 | 5,714 |
| Samoa | Parliament (Palemene) | Legislative Assembly (Fono Aoao Faitulafono) | Unicameral | 5 | | 51 | 3,916 |
| San Marino | Grand and General Council (Consiglio Grande e Generale) | Unicameral | 5 | | 60 | 536 |
| São Tomé and Príncipe | National Assembly (Assembleia Nacional) | Unicameral | 4 | | 55 | 3,330 |
| Saudi Arabia | Consultative Assembly (مجلس الشورى, Majlis Ash-Shura) | non-parliamentary | 4 | Appointed by the King | 150 | 220,000 |
| Senegal | National Assembly (Assemblée nationale) | Unicameral | 5 | Parallel system | 150 | 85,701 |
| Serbia | National Assembly (Народна скупштина / Narodna skupština) | Unicameral | 4 | Party-list proportional representation with 3% electoral threshold | 250 | 28,482 |
| Seychelles | National Assembly (Assemblée nationale / Lasanble Nasyonal) | Unicameral | 5 | Parallel voting | 31 | 2,709 |
| Sierra Leone | Parliament | Unicameral | 5 | Party-list proportional representation | 146 | 40,136 |
| Singapore | Parliament (Parlimen / 国会, guó huì / நாடாளுமன்றம், Nāṭāḷumaṉṟam) | Unicameral | 5 | First-past-the-post voting (MP) (in single member constituencies), Party block voting (in group representation constituencies), and appointed by the President (NMP) | 103 | 52,360 |
| Slovakia | National Council (Národná rada) | Unicameral | 4 | Open list proportional representation with a 5% electoral threshold (7% for two-, three-party alliances; 10% for four-or-more party alliance) allocated under the largest remainder method with Hagenbach-Bischoff quota | 150 | 35,980 |
| Slovenia | Parliament (Državni zbor Republike Slovenije) | National Assembly (Državni zbor) | Lower | 4 | Open list proportional representation with a 4% election threshold | 90 | 22,779 |
| National Council (Državni svet) | Upper | 5 | First-past-the-post indirect elections held within 'functional' interest organisations and 'local' interest communities by electoral bodies (electors). | 40 | 51,254 |
| Solomon Islands | National Parliament | Unicameral | 4 | First-past-the-post | 50 | 10,460 |
| Somalia | Federal Parliament (Baarlamaanka Federaalka / لبرلمان الاتحادي, albarlaman alaitihadi) | House of the People | Lower | 4 | Appointed by president | 275 | 36,675 |
| Senate (Aqalka Sare) | Upper | 4 | majority | 54 | 180,100 |
| South Africa | Parliament | National Assembly | Lower | 5 | proportional closed list | 400 | 126,466 |
| National Council of Provinces | Upper | | Elected by provincial legislatures | 90 | 562,075 |
| South Korea | National Assembly (국회 / 國會, Gukhoe) | Unicameral | 4 | majority and proportional | 300 | 166,691 |
| South Sudan | National Legislature | National Legislature Assembly | Lower | | | 170 | 48,591 |
| Council of States | Upper | | Appointed by President | 50 | 165,210 |
| Spain | General Courts (Cortes Generales) | Congress of Deputies (Congreso de los Diputados) | Lower | 4, unless elections are called earlier. | proportional closed list | 350 | 131,894 |
| Senate (Senado) | Upper | 4, unless elections are called earlier. | 208 are appointed through general election and 57 when regional legislatures are renewed, which not always happens at the same date | 265 | 173,545 |
| Sri Lanka | Parliament (පාර්ලිමේන්තුව, Parlimenthuwa / பாராளுமன்றம், Nāṭāḷumaṉṟam) | Unicameral | 5 | Open list proportional representation | 225 | 90,122 |
| Sudan | National Legislature (المجلس التشريعي, Al-Maǧlis al-Ttašriyʿiy) | National Assembly (المجلس الوطني, Al-Maǧlis al-Waṭaniy | Lower | 6 | | 426 | 68,653 |
| Council of States (المجلس الولايات, Al-Maǧlis al-Wilāyāt) | Upper | 6 | | 50 | 617,880 |
| Suriname | National Assembly (Nationale Assemblée) | Unicameral | 5 | Open list proportional representation | 51 | 10,470 |
| Sweden | Riksdag (Riksdagen) | Unicameral | 4 | Open list proportional representation through the Sainte-Laguë method with a 4% election threshold in constituencies based upon the Counties of Sweden | 349 | 27,286 |
| Syria | People's Assembly (مجلس الشعب, Majlis al-Sha'ab) | Unicameral | 4 | | 210 | 86,964 |
| Switzerland | Federal Assembly (Bundesversammlung / Assemblée fédérale / Assemblea federale / Assamblea federala) | National Council (Nationalrat / Conseil national / Consiglio nazionale / Cussegl naziunal) | Lower | 4 | Open-list proportional with panachage and apparentment by canton. | 200 | 40,000 |
| Council of States (Ständerat / Conseil des États / Consiglio degli Stati / Cussegl dals chantuns) | Upper | 4 | Each canton has one or two seats, two-round or proportional representation depending on the canton. | 46 | 173,913 |
| Tajikistan | Supreme Assembly (Маҷлиси Олии, Majlisi Oli) | Assembly of Representatives (Маҷлиси намояндагон, Majlisi namoyandagon) | Lower | 5 | | 63 | 123,809 |
| National Assembly (Маҷлиси миллии, Majlisi Millii) | Upper | 5 | | 33 | 236,363 |
| Tanzania | National Assembly (Bunge) | Unicameral | 5 | Parallel voting | 384 | 120,974 |
| Thailand | National Assembly (รัฐสภา, Rạṭ̄hs̄p̣hā) | House of Representatives (สภาผู้แทนราษฎร, S̄p̣hā p̄hū̂thæn rās̄ʹḍr) | Lower | 4 | parallel (First-past-the-post voting for 400 members and proportional party list for 100 members) | 500 | 131,950 |
| Senate (วุฒิสภา, Wutthisapha) | Upper | 5 | Indirect limited voting with self-nomination | 200 | 329,876 |
| Togo | National Assembly (Assemblée nationale) | Unicameral | 5 | Party list proportional representation | 113 | 76,434 |
| Tonga | Legislative Assembly (Fale Alea) | Unicameral | 4, Unless elections are called early | Single non-transferable vote | 25 | 3,962 |
| Trinidad and Tobago | Parliament | House of Representatives | Lower | 5 | | 41 | 32,139 |
| Senate | Upper | | | 31 | 42,506 |
| Tunisia | Parliament of Tunisia (البرلمان التونسي, al-Barlamān at-Tūnsī) | Assembly of the Representatives of the People (مجلس نواب الشعب, Mejlis Nuwwēb esh-She‘b) | Lower | 5 | Two-round system | 161 | 72,722 |
| National Council of Regions and Districts (المجلس الوطني للجهات والأقاليم, Al Majlis Al Watani l'il Jihet W'al Akalim) | Upper | 5 | Indirect two-round system | 77 | 152,057 |
| Turkey | Grand National Assembly (Türkiye Büyük Millet Meclisi) | Unicameral | 5 | Closed list proportional representation D'Hondt method with a 7% electoral threshold for political parties or political alliances | 600 | 135,862 |
| Turkmenistan | Assembly (Mejlis) | Unicameral | 5 | majority voting in single member constituencies. | 125 | 41,360 |
| Tuvalu | Parliament (Palamene) | Unicameral | 4 | Multiple non-transferable vote | 15 | 666 |
| Uganda | Parliament (Bunge) | Unicameral | 5 | Parallel voting: First-past-the-post voting (499 seats), Indirect election (30 seats) | 529 | 87,839 |
| Ukraine | Verkhovna Rada (Верховна Рада, Verkhovna Rada) | Unicameral | 5 | | 450 | 101,248 |
| United Arab Emirates | Federal National Assembly (المجلس الوطني الإتحادي, Majlis Watani Ittihad) | Unicameral | 4 | | 40 | 206,601 |
| United Kingdom | Parliament | House of Commons | Lower | 5, unless elections are called earlier. | First-past-the-post voting in single member constituencies. | 650 | 95,787 |
| House of Lords | Upper | Life (life and hereditary peers) Until end of religious term(bishops) | Life peers appointed by the Sovereign on advice of prime minister. 92 are elected by and from hereditary peers using preferential voting. 26 Lords Spiritual are bishops of the Church of England, chosen by the Church mainly based on seniority (except that female bishops are appointed regardless of seniority). | 837 | 86,700 |
| United States | Congress | House of Representatives | Lower | 2 | Depends on the state, mainly First-past-the-post voting, in single-member constituencies. | 435 | 722,636 |
| Senate | Upper | 6 | Depends on the state, mainly First-past-the-post voting. One-third of the Senate goes up for election every two years. Each state has two senators. | 100 | 3,432,530 |
| Uruguay | General Assembly (Asamblea General) | Chamber of Representatives (Cámara de Representantes) | Lower | 5 | | 99 | 33,195 |
| Chamber of Senators (Cámara de Senadores) | Upper | 5 | | 30 | 109,543 |
| Uzbekistan | Oliy Majlis (Oliy Majlis, Олий Мажлис) | Legislative Chamber (Qonunchilik palatasi, Қонунчилик палатаси) | Lower | 5 | | 150 | 194,156 |
| Senate (Senati, Сенати) | Upper | 5 | | 100 | 291,234 |
| Vanuatu | Parliament (Palamen / Parlement) | Unicameral | 4 | Single non-transferable vote | 52 | 4319 |
| Vatican City/Holy See | Pontifical Commission (Pontificia Commissione / Pontificia Commissio) | Unicameral | 5 | | 7 | 114 |
| Venezuela | National Assembly (Asamblea Nacional) | Unicameral | 5 | | 277 | 175,430 |
| Vietnam | National Assembly (Quốc hội) | Unicameral | 5 | Plurality block voting | 500 | 176,385 |
| Yemen | Parliament | House of Representatives (مجلس النواب, Majlis al-Nuwaab) | Lower | 6 | | 301 | 81,485 |
| Shura Council (مجلس الشورى, Majlis ash-Shura) | Upper | Life | | 111 | 220,963 |
| Zambia | National Assembly | Unicameral | 5 | First-past-the-post and appointments by the President | 166 | 87,284 |
| Zimbabwe | Parliament | National Assembly | Lower | 5 | | 210 | 61,971 |
| Senate | Upper | 5 | | 40 | 325,350 |