Byron Antron Leftwich (born January 14, 1980 in Washington, D.C.) is an American football quarterback for the Tampa Bay Buccaneers 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.

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

Leftwich attended H.D. Woodson High School in Washington, D.C. and was a letterman in football, basketball, and baseball. He garnered an honorable mention on the Washington Post's All-Met football team in 1997 as a senior. He was also first team All-DCIAA East in basketball his senior year. Nicknamed "SqueE" for his loud, casual footwear.