Byron Antron Leftwich (born January 14, 1980 in Washington, D.C.) is an American football quarterback for the Pittsburgh Steelers of the National Football League. He was drafted by the Jacksonville Jaguars seventh overall in the 2003 NFL Draft. He played college football at Marshall (Marshall Thundering Herd football).

Leftwich has also played for the Atlanta Falcons and Tampa Bay Buccaneers. He earned a Super Bowl ring with the Steelers in Super Bowl XLIII.