Main building of the Royal Swedish Academy of Sciences in Stockholm
The Finnish Academy of Science and Letters along the Mariankatu street in Helsinki
The Keck Center of the National Academies in Washington, D.C., one of several facilities where the National Academy of Sciences maintains offices
Slovak Academy of Sciences (Presidium Building)
Entrance of the Pontifical Academy of Sciences
Ungern-Sternberg palace on Toompea, nowadays the main building of Estonian Academy of Sciences
The main building of the Academy of Athens, located in central Athens, Greece

An academy of sciences is a type of learned society or academy (as special scientific institution) dedicated to sciences that may or may not be state funded. Some state funded academies are national, or royal (i.e. United Kingdom's Royal Society of London for Improving Natural Knowledge) as a form of honor.

The other type of academies are Academy of Arts or combination of both (e.g., American Academy of Arts and Sciences). Academy of Letters is another related expression, encompassing literature. In non-English-speaking countries, the range of academic fields of the members of a national Academy of Science often includes scholarly disciplines which would not normally be classed as "science" in English. Many languages use a broad term for systematized learning which includes both natural sciences and social sciences and fields such as literary studies, linguistics, history, or art history. (Often these terms are calques from Latin scientia (the etymological source of English science) and, accordingly, derivatives of the verb 'know', such as German Wissenschaft, Swedish vetenskap, Hungarian tudomány, Estonian teadus or Finnish tiede.) Accordingly, for example the Austrian Academy of Sciences (Österreichische Akademie der Wissenschaften), the Hungarian Academy of Sciences (Magyar Tudományos Akadémia), or the Estonian Academy of Sciences (Eesti Teaduste Akadeemia) also cover the areas of social sciences and humanities.

As the engineering sciences have become more varied and advanced, there is a recent trend in many advanced countries to organize the National Academy of Engineering (or National Academy of Engineering Sciences), separate from the national academy of sciences.

Academies of science play an important role in science diplomacy efforts. Academies are increasingly organized in regional or even international academies. The Interacademy Partnership for example is a global network consisting of over 140 national, regional and global member academies of science, engineering and medicine. Pan-Europe academies include the Academia Europaea and the European Academy of Sciences and Arts. Additionally, there are many regional associations such as ALLEA in Europe, NASAC as the Network of African Science Academies, IANAS in Latin America, and AASSA in Asia. The International Science Council brings together international scientific unions and associations as well as national and regional scientific organizations such as academies and research councils from the natural sciences, social sciences and the humanities.

Apart from national academies of science, there are now increasingly also national young academies. National young academies usually select members for a limited term, normally 4–5 years, after which members become academy alumni. Young academies typically engage with issues important to young scientists. These include, for example, science education or the dialog between science and society. Most young academies are affiliated with a senior Academy of Sciences or with a network of senior academies. The Global Young Academy, which itself is a science academy (e.g. full member of Interacademy Partnership) often serves as a facilitator of the growing global network of young academies. Since its creation, more than 35 national young academies have been established. In 2019, there were 41 national young academies.

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