John Christian Gesek, Jr. (born February 18, 1963 in San Francisco, California) is a former American football offensive lineman who played nine seasons in the National Football League for the Los Angeles Raiders, the Dallas Cowboys, and the Washington Redskins. He played college football at Sacramento State University and was drafted in the tenth round of the 1987 NFL Draft.
After attending San Ramon Valley High School, he moved on to Diablo Valley College, before selecting Sacramento State University during its non-scholarship Division II years, where he started at offensive tackle.
He was inducted into the Sacramento State Football Hall of Fame and the school also created the annual "John Gesek Outstanding Offensive Lineman Award" in his honor.
Gesek was selected by the Los Angeles Raiders in the 10th round of the 1987 NFL Draft and got chance to start one game as a rookie at right guard, before being placed on the injured reserve list on September 7. The next season after Charley Hannah suffered a season ending knee injury, he started 6 games between left guard and center, but again was placed on the injured reserve list on November 30.