Russell Cunningham (December 29, 1905 – March 6, 1985) was a Canadian social democratic politician from Cape Breton Island in Nova Scotia. He was the leader of the Co-operative Commonwealth Federation in Nova Scotia from 1945 until 1953. He succeeded Donald MacDonald as the party's leader, after MacDonald lost his seat in the 1945 general election.He represented the electoral district (riding) of Cape Breton East in the Nova Scotia House of Assembly from 1945 until 1956. Due to the Conservatives not electing a single member to the Assembly, Cunningham became the leader of the Official Opposition during the 44th General Assembly of Nova Scotia. Even though the CCF lost a seat, it was the first time they ever were the Official Opposition. Their successor party, the Nova Scotia New Democratic