Lynn Dwight Cain (born October 16, 1955) is a retired American football running back in the National Football League.
Cain played college football at the University of Southern California after transferring from East Los Angeles College.
Lynn Cain was starting fullback for 1979 USC Trojans, who won the National Title that year. Sharing the backfield with Lynn was Heisman Trophy winner Charles White.
Cain played for the National Football League's Atlanta Falcons from 1979 to 1984 and for the Los Angeles Rams in 1985. He was drafted in the fourth round of the 1979 NFL Draft. He managed to have his best year in the NFL in his second season, 1980, rushing for over 900 yards and 8 touchdowns. Lynn wore #21 for the Falcons, and took the Falcons to the 1980 NFC Divisional Playoff Game (The Philadelphia Eagles defeated the Dallas Cowboys 20-7 in the NFC Championship), along with William Andrews and Steve Bartkowski.
Cain was hired in December 2007, to coach his junior college alma mater, East Los Angeles College. He coached at ELAC through the 2011 football season.
Cain is the uncle of The Black Eyed Peas rapper/singer/producer, will.i.am.