Bruce G. Sinclair (born c. 1928) is a former politician in Toronto, Ontario. He was mayor of Etobicoke from 1984 to 1993, when he was defeated by Doug Holyday. Before becoming mayor, he served 15 years on Etobicoke's council as alderman and controller. From 1998 to 2000 he was a member of Toronto City Council, but was defeated in the 2000 Toronto municipal election.