The 1961 Commonwealth Prime Ministers' Conference was the eleventh Meeting of the Heads of Government of the Commonwealth of Nations. It was held in the United Kingdom in March 1961, and was hosted by that country's Prime Minister, Harold Macmillan. Concerns were also expressed about Britain's prospective membership in the Common Market and the possible impact on trade relations between the United Kingdom and the Commonwealth. The Commonwealth also expressed its support for worldwide disarmament "subject to effective inspection and control".