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 British Prime Minister Harold Wilson.

The conference was dominated by the rebellion of the British colony of Rhodesia, under the white minority rule of Ian Smith. Facing the possible collapse of the Commonwealth, with African states threatening to leave the association if no action was taken against Rhodesia, Britain agreed to a policy of no independence before majority rule (NIBMAR). In case Rhodesia did not comply, Britain declared it would participate in 'a resolution providing for effective and selective mandatory economic sanctions against Rhodesia' at the United Nations.

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

Participants The following nations were represented: Nation Name Position Harold Wilson (Chairman) Prime Minister Harold Holt Prime Minister Lester Pearson Prime Minister A. F. Wijemanne Minister of Justice Makarios III President Sir Dawda Jawara Prime Minister Forbes Burnham Prime Minister Swaran Singh Minister of External Affairs Donald Sangster Acting Prime Minister Joseph Murumbi Vice-President Hastings Banda President Tunku Abdul Rahman Prime Minister Giorgio Borġ Olivier Prime Minister Keith Holyoake Prime Minister Babafemi Ogundipe High Commissioner Sharifuddin Pirzada Minister for Foreign Affairs Sir Albert Margai Prime Minister Lee Kuan Yew Prime Minister Patrick Solomon Minister of Foreign Affairs Milton Obote Prime Minister Simon Kapwepwe Minister of Foreign Affairs

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