Mark K. Koncar (born May 5, 1953) is an American former professional football player who was an offensive tackle in the National Football League (NFL).
After graduating from high school Koncar attended the University of Colorado Boulder.
Koncar was selected by the Green Bay Packers in the 1976 NFL draft, playing for five seasons before playing for the Houston Oilers.
After playing for the Oilers he retired.
This biographical article relating to an American football offensive lineman born in the 1950s is a stub.