Jean-Guy Lagace (born February 5, 1945 in L'Abord-à-Plouffe, Quebec) is a former professional ice hockey defenceman. He played in the National Hockey League with the Pittsburgh Penguins, Buffalo Sabres, and Kansas City Scouts; in addition, he played one season in the World Hockey Association with the Birmingham Bulls.
In his NHL career, Lagace played in 197 games, scoring nine goals and adding 39 assists. In the WHA, Lagace played in 78 games, scoring two goals and adding 25 assists.