Walter Assef (May 31, 1913 – January 14, 1988) was a Canadian politician, and former Vaudevillian, who served as mayor of the city of Thunder Bay, Ontario. He was the first, and so far the only mayor, to have been elected for two discontinuous terms. He was first elected in 1973 and served until 1978. His second term began when he was re-elected in 1981 and lasted until 1985.