Jean Joseph "Black Cat" Gagnon (June 3, 1905 in Chicoutimi, Quebec – March 21, 1984) was a Canadian ice hockey forward.

During this time, he played for the New York Americans, Boston Bruins, and Montreal Canadiens.

Gagnon loved to tell the story of how, as a Canadiens "wanna-be," he filled his pockets with 10 pounds (4.5 kg) of rocks during a weigh-up and, having impressed Canadiens brass with his 150 lb (68 kg) weight, got a tryout with the team, who had formerly shunned him as being "too light for pro hockey."

Gagnon was a modest sort who gave all the credit to his two superstar linemates, Howie Morenz and Aurel Joliat, claiming he'd simply pass them the puck, stand back, and get the assists.

This biographical article relating to a Canadian ice hockey player is a stub.