John Powell (June 19, 1809 – February 24, 1881) was a Canadian politician who served as mayor of Toronto and played an important role in the Upper Canada Rebellion. Powell was a member of the "Family Compact," the small group of elite families that controlled the politics of Upper Canada in the first half of the nineteenth century. His father, Captain John Powell, was the son-in-law of General Æneas Shaw and his grandfather was Chief Justice William Dummer Powell. He was also a member of the Orange Order in Canada.