William Muir (born October 26, 1942) is a former American football coach who served as the offensive coordinator for the Tampa Bay Buccaneers and later as the offensive coordinator and offensive line coach of the Kansas City Chiefs. Muir was fired from the Buccaneers along with five fellow assistant coaches on January 18, 2009. Muir has coached for 8 NFL franchises, 3 different colleges, and 2 minor league football teams with over 40 years combined coaching experience. Muir announced his retirement from coaching on February 1, 2012. Muir graduated with a B.A. from Susquehanna University in 1965. Muir is married to Barbara and has 2 children and 5 grandchildren.