Cy Denneny (October 23, 1897 in Farran's Point, Ontario - September 9, 1970) was a Canadian professional ice hockey forward who played for the Ottawa Senators and Boston Bruins in the National Hockey League and the Toronto Blueshirts of the National Hockey Association. Cy Denneny led the Senators to Stanley Cup victories four times and the Bruins once. He was inducted into the Hockey Hall of Fame in 1959.