Duncan James Sinclair
Duncan James Sinclair was a Liberal party member of the House of Commons of Canada. He was born in Brooke Township, Ontario and became a physician.
He was elected to Parliament at the Oxford North riding in the 1921 Canadian [federal election|1921 general election]. After serving his only federal term, the 14th Canadian Parliament, Sinclair was defeated in the 1925 federal election by Donald Sutherland of the Conservatives.