Patrick M. Barnes (born February 23, 1975) is an American former professional football player who was a quarterback in the National Football League (NFL), XFL, and Canadian Football League (CFL). He played college football for the California Golden Bears, becoming one of the most prolific quarterbacks in program history, and was selected by the Kansas City Chiefs in the fourth round of the 1997 NFL draft. Barnes played professionally from 1997 to 2003.

Barnes played college football at the University of California, Berkeley, where he emerged as one of the most productive quarterbacks in school history. He served as the primary backup to Dave Barr during the 1993 season, but following an injury to Barr and a midseason three-game losing streak, Barnes was pressed into action and made his first career start against Arizona State, burning his redshirt in the process.

Entering the 1994 season, Barnes was again expected to serve as Barr’s backup, but injuries once more forced him into extended playing time. He started the final three games of the season, highlighted by a victory over rival Stanford in the season finale that helped stabilize the program.

Barnes became Cal’s full-time starter in 1995 and held the role through his senior season in 1996. Under head coach Steve Mariucci during the 1996 season, Barnes operated in Mariucci’s version of the West Coast offense and earned a reputation as a poised distributor who spread the ball effectively and excelled throwing on the run. During the season, he attempted 420 passes, set a then–Pac-10 record for touchdown passes, and posted a 31–8 touchdown-to-interception ratio. A signature performance came against Arizona in a four-overtime game, when Barnes threw for 503 yards and eight touchdown passes, tying a conference record. His overall performance earned him second-team All-Pac-10 honors, finishing behind Jake Plummer.

Barnes concluded his collegiate career as one of the most accomplished quarterbacks in Cal history, setting multiple single-season and career records and leading the Golden Bears to a bowl appearance. He capped his career by appearing in the 1996 Senior Bowl, where he threw three touchdown passes and was named the game’s Most Valuable Player, though the performance was marred by a broken right wrist sustained during the game.

Bowl games only began counting toward single-season and career statistics in 2002.

Barnes was selected by the Kansas City Chiefs in the fourth round (110th overall) of the 1997 NFL draft, joining his collegiate teammate Tony Gonzalez. He did not appear in a game during the 1997 season and was listed third on the depth chart. During the following offseason, the organization sought to assign Barnes to NFL Europe, but he declined and remained with the Chiefs through offseason activities. He was released on August 25, 1998, following the fourth preseason game, after Kansas City signed Todd Collins.

On September 9, 1998, Barnes was signed to the Washington Redskins practice squad. He was released six days later, on September 15, 1998.