The September 1966 Commonwealth Prime Ministers' Conference was the 16th Meeting of the Heads of Government of the Commonwealth of Nations. It was held in the United Kingdom and was hosted by that country's Prime Minister, Harold Wilson.

The conference was dominated by the rebellion of the British colony of Rhodesia which was under the white minority rule regime of Ian Smith. Facing the possible collapse of the Commonwealth, with African states threatening to leave the association if action wasn't taken against Rhodesia, Britain agreed to a policy of No independence before majority rule (NIBMAR). The Commonwealth issued an ultimatum declaring that if the Smith regime did not comply by the end of the year Britain, with Commonwealth support, would seek mandatory sanctions against Rhodesia by the United Nations.

The Commonwealth also issued a statement calling for nuclear disarmament and deploring nuclear weapons testing by France and China.

Participants

The following nations were represented:

NationNamePosition
United KingdomHarold Wilson (Chairman)Prime Minister
AustraliaHarold HoltPrime Minister
CanadaLester PearsonPrime Minister
CeylonA. F. WijemanneMinister of Justice
CyprusMakarios IIIPresident
The GambiaSir Dawda JawaraPrime Minister
GuyanaForbes BurnhamPrime Minister
IndiaSwaran SinghMinister of External Affairs
JamaicaDonald SangsterActing Prime Minister
KenyaJoseph MurumbiVice-President
MalawiHastings BandaPresident
MalaysiaTunku Abdul RahmanPrime Minister
MaltaGiorgio Borġ OlivierPrime Minister
New ZealandKeith HolyoakePrime Minister
NigeriaBabafemi OgundipeHigh Commissioner
PakistanSharifuddin PirzadaMinister for Foreign Affairs
Sierra LeoneSir Albert MargaiPrime Minister
SingaporeLee Kuan YewPrime Minister
Trinidad and TobagoPatrick SolomonMinister of Foreign Affairs
UgandaMilton ObotePrime Minister
ZambiaSimon KapwepweMinister of Foreign Affairs