Michael Alfred Gartner (born October 29, 1959 in Ottawa, Ontario) is a retired Canadian professional ice hockey right winger who played 19 seasons in the National Hockey League for the Washington Capitals, Minnesota North Stars, New York Rangers, Toronto Maple Leafs and Phoenix Coyotes. He also played one season in the defunct World Hockey Association for the Cincinnati Stingers.
Gartner was drafted in the 1st round, 4th overall, by the Washington Capitals in the 1979 NHL Entry Draft. He started his professional career playing in the WHA as an underager with the Cincinnati Stingers in 1978–79. He played on a line with Mark Messier and had a successful campaign, finishing second to Wayne Gretzky for Rookie-of-the-Year honors. As a result, with the WHA folding at the end of the season, he played the next season with the Capitals, and would play for them for the better part of ten seasons. He recorded an assist in his NHL debut on October 11, 1979, versus the Buffalo Sabres, and he wore number eleven for the Caps.
Gartner had a solid season in 1979–80, winning the Capitals' Rookie of the Year and MVP awards, as well as being voted by their fans as the team's Most Promising Player. He also led the team with 36 goals. Gartner was traded to the Minnesota North Stars on March 7, 1989, with Larry Murphy for Dino Ciccarelli and Bob Rouse. He left the Capitals as the team's all-time leader in career goals, assists and points, and currently stands second in those three categories.