Michael Singletary (born October 9, 1958), also known by his nickname "Samurai Mike", is an American professional football coach and former middle linebacker. After playing college football for the Baylor Bears, Singletary was drafted by the Chicago Bears in the second round of the 1981 NFL Draft and was known as "The Heart of the Defense" for the Chicago Bears' Monsters of the Midway in the mid-1980s. He was part of their Super Bowl XX championship team that beat the New England Patriots. Singletary was inducted into the Texas Sports Hall of Fame in 1995 and into the Pro Football Hall of Fame in 1998.

Singletary later pursued a career as a coach, first as a linebackers coach for the Baltimore Ravens, then as the linebackers coach for the San Francisco 49ers. In 2008, the 49ers promoted Singletary to the head coaching position after previous head coach Mike Nolan was fired during the season, and he remained in that position until he was fired after the 49ers were eliminated from playoff contention with one game remaining in the 2010 season. He has also coached for the Los Angeles Rams, the Memphis Express of the now-defunct AAF, and a brief two-season stint as the head coach of a high school team.