• Height: 6-5
• Weight: 222
• Born: Oct 11, 1977 – Waxahachie, Texas
• College: Oklahoma State
• Draft: 2000 – 1st round (17th pick) by the Seattle SuperSonics

Desmond Tremaine Mason (born October 11, 1977 in Waxahachie, Texas) is an American professional basketball player for the Oklahoma City Thunder of the NBA. He is designated as a shooting guard and small forward.
He was drafted out of Oklahoma State University by the Seattle SuperSonics with the 17th pick of the 2000 NBA Draft. In 2001, he became the first Sonics player in franchise history to win the NBA Slam Dunk Contest. In 2003, he and Gary Payton were traded to the Milwaukee Bucks in exchange for Ray Allen and Ronald “Flip” Murray. On October 26, 2005, he was traded along with a 2006 first-round draft pick to the New Orleans/Oklahoma City Hornets in exchange for Jamaal Magloire. On July 23, 2007 Mason signed a contract with the Bucks after a two-season absence. Initially angry with Bucks general manager Larry Harris for trading him in 2005, Mason said he was happy to be back in Milwaukee. However, Mason was later traded to Oklahoma City in a three-team trade also involving the Milwaukee Bucks and Cleveland Cavaliers on August 13, 2008.