Reggie Wayne Theus (born October 13, 1957 in Inglewood, California) is a former NBA player and is currently the head coach for the Sacramento Kings. He was hired as head coach for the Kings on June 19, 2007.

Prior to taking over as the Kings' coach Theus coached New Mexico State University's men's basketball team. On March 31, 2005, NMSU hired the 13-year NBA veteran. In just his second year as head coach, Theus led NMSU to their 17th NCAA Tournament, their first tournament appearance since 1999, and coached NMSU to its 14th conference tournament title which earned them an automatic bid into the NCAA tournament. He was also previously an assistant coach for the University of Louisville (where he studied mathematics) under Rick Pitino.

In his first season, Theus turned the Aggies from a 6-24 squad in 2004-05 to a 16-14 team in the 2005-06 season --matching the fifth best turn-around for a Division-I men's basketball team. Another achievement by Theus was the recruitment of Herb Pope for the 2007-2008 season, a 5 star recruit in the 2011 collegiate senior class. Pope is from Aliquippa, PA, and was recruited by national powerhouses such as Louisville, Memphis, Pittsburgh, and Texas. However, on the two-year anniversary of Theus' hiring at NMSU, Pope was shot four times at a party, putting a question mark on his temporary future in basketball until it became clear that Pope would be ready to play for his freshman season. Theus was briefly recruited to be the head coach at Creighton University when coach Dana Altman left for the University of Arkansas. However, Altman decided to return to Creighton after several days at Arkansas.