John "Jack" Douglas (April 24, 1930 – January 12, 2003) was a Canadian ice hockey defenceman who competed in the 1960 Winter Olympics. He was born in Trenton, Ontario. Throughout his hockey career, he was known for his "six inch slapper", where he would take make a powerful slapshot by moving his stick only six inches.
Douglas won the silver medal at the 1960 Winter Olympics in ice hockey. He played for Indianapolis Chiefs, Chatham Maroons and Pittsburgh Hornets. Douglas played 1 match in the American Hockey League and 119 matches in the International Hockey League.