Frederick J. Beavis (October 8, 1914 – July 11, 1997) was a longtime city councillor in Toronto, Ontario, who briefly served as interim mayor of the city in 1978. Beavis operated the Beavis Bros. Roofing Co. with his brothers before becoming a full-time politician. Beavis became an alderman in 1961 in the city's Ward 1 (Ward 8 1974–1985, Metro Ward 8 1985–1988) for Riverdale, Toronto. Except for a brief period between 1975 and 1977, he served on the council until 1988. He served on several committees and sat on Metro Council as well. He was also a member of Metro's executive committee.