Harry "Rat" Westwick (April 22, 1876 in Ottawa, Ontario - April 3, 1957) was a Canadian ice hockey player. Westwick, nicknamed the Rat by a journalist, is most noted for his play with the Ottawa Hockey Club, nicknamed the Silver Seven during his day which won and defended the Stanley Cup from 1903 until 1906. He was a member of the Ottawa Capitals lacrosse team from 1896 until 1904, winning three championships.