Keith Matthew Tkachuk (born March 28, 1972, in Boston, Massachusetts) is an American professional ice hockey player and alternate captain currently playing for the St. Louis Blues of the National Hockey League (NHL).

Keith began his hockey career at Malden Catholic High School in Malden, Massachusetts. Tkachuk played collegiate hockey at Boston University, was a member of the U.S. National Junior team in 1991 and 1992, and a member of the U.S. Olympic team in 1992. He was drafted in the first round (19th overall) in the 1990 entry draft by the Winnipeg Jets.

Only days after the end of the Olympics, Tkachuk made his NHL debut on February 28, 1992, against the Vancouver Canucks and tallied an assist. He would finish the season with the Jets, getting eight points in 17 games. In the playoffs that year, he scored three goals in seven games. The following season, 1992–93, was Tkachuk's official rookie year. He appeared in 83 games and ended the season with 28 goals and 51 points, including a 12–game scoring streak from March 9 to April 3, 1993.