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

Johnny Gagnon
Born	(1905-06-03)June 3, 1905 Chicoutimi, Quebec, Canada
Died	March 21, 1984(1984-03-21) (aged 78) Cranston, Rhode Island, U.S.
Height	5 ft 5 in (165 cm)
Weight	140 lb (64 kg; 10 st 0 lb)
Position	Right wing
Shot	Right
Played for	Montreal Canadiens Boston Bruins New York Americans
Playing career	1923–1945

Johnny played in the National Hockey League from 1930 to 1940. During this time, he played for the New York Americans, Boston Bruins, and Montreal Canadiens. He also played for the Providence Reds of the American Hockey League. He won the Stanley Cup in 1931 with the 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.

After his retirement, he became a scout for the New York Rangers. He was in part responsible for the Rangers getting the great goaltender Eddie Giacomin, scouting him when he played for the American Hockey League's Providence Reds and becoming friends with Giacomin. He gave Rangers' general manager Emile Francis glowing reports on Giacomin, and finally Francis decided to see Giacomin play. Francis eventually obtained Giacomin for four players.

Gagnon died after a lengthy illness on March 21, 1984.