Thomas Thornbury (born March 17, 1963 in Lindsay, Ontario) is a retired Canadian professional ice hockey defenceman who played 14 games in the National Hockey League for the Pittsburgh Penguins. He played junior hockey for the Niagara Falls Flyers, North Bay Trappers, and Cornwall Flyers from 1980 to 1983. The Pittsburgh Penguins chose him 49th overall in the 1981 NHL Entry Draft.