Javon Alexander Mack (born November 19, 1985) is an American former professional football player who was a center in the National Football League (NFL). He played college football for the California Golden Bears and was selected by the Cleveland Browns in the first round with the 21st overall selection of the 2009 NFL draft. He also played for the Atlanta Falcons and the San Francisco 49ers. He was inducted into the College Football Hall of Fame in 2025.

Mack was born in Los Angeles, California. He attended San Marcos High School in Santa Barbara, where he was named the Channel League's Co-Most Valuable Player on defense and earned a first-team all-league selection. He was also selected to the All-CIF team. In addition to football, Mack wrestled for four years with the Royals, losing only two matches his senior year and reaching the state final. He was a CIF champion as a junior and a senior. In the classroom, he compiled a 4.2 GPA and an 1180 SAT score.

Considered a two-star recruit by Rivals.com, Mack chose California over Northwestern and Stanford.

Mack played for the California Golden Bears football team while attending the University of California, Berkeley. He made 39 consecutive starts for the Golden Bears registering 256 key blocks/knockdowns, 32 touchdown-resulting blocks and 29 down field blocks. Mack compiled a 3.61 undergraduate GPA at the University of California, Berkeley as a legal studies major. He graduated in 2008 and played the 2008 season as a graduate student in education. He won the Draddy Trophy, also dubbed the "academic Heisman", for his academic success in 2008, becoming the first Cal player and the second consecutive center to earn the trophy, following Dallas Griffin of Texas. He also won the Morris Trophy in 2007 and 2008, making him the third offensive lineman and the first since Washington's Lincoln Kennedy in 1991 and 1992 to win the award twice. Mack also represented Cal at the 2009 Senior Bowl.

Projected as a first-to-second rounder by Sports Illustrated, Mack was the highest ranked center available in the 2009 NFL draft.

Mack was drafted in the first round by the Cleveland Browns with the 21st overall selection. He was the first Golden Bears offensive lineman selected in the first round since Tarik Glenn in 1997.

Mack signed a five-year contract with the Browns on July 25. During the 2009 NFL season, Mack started on the Browns offensive line every game. After a shaky start, the Browns line, anchored by Joe Thomas, paved the way to three consecutive 100+ yard games by Jerome Harrison and one game in which Harrison ran for 286 yards, which stands at third all-time in one game. At the end of the regular season, Mack was selected as center on the All-Rookie team. He started all 16 games, committed only 1 penalty and allowed just 1 sack.

During the 2010 NFL season, Mack again started every game for the Browns. He was named to the 2011 Pro Bowl roster as a second alternate to replace Nick Mangold. During week 5 of the 2011 NFL season, Mack played through appendicitis during a loss to the Tennessee Titans. Mack had an appendectomy during Cleveland's bye week and came back and started against the Oakland Raiders the week after the bye week.