The 1973 United Nations Security Council election was held on 15 October 1973 during the Twenty-eighth session of the United Nations General Assembly, held at United Nations Headquarters in New York City. The General Assembly elected the Byelorussian SSR, Cameroon, Costa Rica, Iraq, and Mauritania, as the five new non-permanent members of the UN Security Council for two-year mandates commencing on 1 January 1974. This was the first election of Cameroon, Costa Rica and Mauritania and the only election of Byelorussian SSR into the council.