Martin Edward Schottenheimer (September 23, 1943 – February 8, 2021) was an American professional football linebacker and coach who served as a head coach in the National Football League (NFL) for 21 seasons. He was the head coach of the Cleveland Browns from 1984 to 1988, the Kansas City Chiefs from 1989 to 1998, the Washington Redskins in 2001, and the San Diego Chargers from 2002 to 2006. Eighth in career wins at 205 and seventh in regular season wins at 200, Schottenheimer has the most wins among the league's head coaches to not win an NFL championship. After coaching in the NFL, he won a 2011 championship in his one season with the Virginia Destroyers of the United Football League (UFL). He was inducted to the Kansas City Chiefs Hall of Honor in 2010.
In his 21 seasons, Schottenheimer reached the playoffs 13 times and had only two losing records. Schottenheimer was also named NFL Coach of the Year with the Chargers in 2004 for leading a team that went 4–12 the previous year to a 12–4 record. However, he won only five of his 18 postseason games and never made a Super Bowl.