Mark Anthony Stock (born April 27, 1966) is an American former professional football wide receiver in the National Football League (NFL) for the Pittsburgh Steelers, Washington Redskins, and Indianapolis Colts. He was selected by the Steelers in the sixth round of the 1989 NFL draft. He also spent a year in the World League of American Football (WLAF) with the World Champions Sacramento Surge and a year in the Canadian Football League (CFL) with the San Antonio Texans. He was a 1988 graduate of Virginia Military Institute and a commissioned officer with the U.S. Army where he spent time on active duty during Operation Desert Storm.