Thain Andrew Simon (April 24, 1922 — September 18, 2007) was a Canadian ice hockey defenceman.
He played three games in the National Hockey League for the Detroit Red Wings during the 1946–47 season.
Thain is the brother of the former NHL player, Cully Simon.
Simon was born in Brockville, Ontario.
This biographical article relating to a Canadian ice hockey defenceman born in the 1920s is a stub.