Matt Kelly Barnes (born March 9, 1980 in Santa Clara, California) is an American professional basketball player currently playing for the Orlando Magic of the National Basketball Association.

Barnes attended Del Campo High School (Fair Oaks, California) and was a letterman in football and basketball. In football, he was an All-American honoree.

After a college career at UCLA, Barnes was a second-round draft choice of the Memphis Grizzlies in the 2002 NBA Draft. He was then traded that summer along with Nick Anderson to the Cleveland Cavaliers for Wesley Person, but was cut that October. He has since played for the Los Angeles Clippers, the Sacramento Kings, the New York Knicks the Philadelphia 76ers, the Golden State Warriors, and the Phoenix Suns averaging 6.1 points per game.