Darrell Antwonne Arthur (born March 25, 1988 in Dallas, Texas) is 6'9", 230 lb (100 kg) American professional basketball player for the Memphis Grizzlies of the NBA. He plays the power forward and small forward positions. Arthur played for the University of Kansas in college for two seasons, including the 2007–2008 national championship team. Arthur was originally drafted by the New Orleans Hornets in 2008 but after two trades ended up with the Memphis Grizzlies, with whom he signed on July 8, 2008.

In high school he guided South Oak Cliff High School to back-to-back Texas 4A state titles in 2005 and 2006 and was the tournament's MVP both years. However, it was later determined that the school illegally changed player's grades to keep them eligible, and the titles have since been forfeited.

His uniform number in college was 00, making him the first Jayhawk to wear that number since Greg Ostertag. Following his freshman season (2006–2007), Arthur was named to the Big 12 All-Freshman team. Arthur is the first cousin of Grizzlies teammate Quinton Ross.