John Felix Rowser (born April 24, 1944) was an American football player, a defensive back in the National Football League for ten seasons with the Green Bay Packers, Pittsburgh Steelers, and Denver Broncos. In his rookie season, he was a member of the Packers' Super Bowl II championship team, Vince Lombardi's last title. He played college football at the University of Michigan as a cornerback and halfback, from 1963 to 1966.