Guillermo Díaz (born March 4, 1985) is a Puerto Rican professional basketball player. Diaz was drafted by the Los Angeles Clippers of the NBA in 2006, becoming the fifth Puerto Rican ever drafted by the NBA and the eighth to play there. Diaz has also played professionally in Europe and in Puerto Rico.

Diaz had a stellar college career at the University of Miami, where he earned All-American status. At the University of Miami, he finished 10th on the school's all-time scoring list with 1,477 points, including 174 three-point field goals. He garnered All-Big East Team Freshman First Team honors in 2003–04 and led Miami in scoring as both a sophomore and a junior. He was named to the All-ACC Team in both his sophomore and junior years.

Diaz declared his eligibility for the NBA draft following his junior year and was selected by the Los Angeles Clippers, with the 52nd overall selection in the 2006 NBA Draft. During the summers of 2006 and 2007, Diaz participated with the team in the NBA Summer Pro League.

On August 16, 2007, Diaz signed a non-guaranteed contract with the Los Angeles Clippers to 3 years $2 million, according to HOOPSHYPE.com. On October 25, Diaz was released at the conclusion of preseason, signing a free agent contract with the Anaheim Arsenal of the NBDL. Through January 8, 2008, Diaz averaged 16.6 points per game in 14 games, with 7 starts.

On January 8, 2008, Diaz was signed to a 10-day contract with the Clippers, in which he debuted against the Phoenix Suns playing 5 minutes and registering 1 rebound. On January 18, the Clippers extended his contract for an additional 10 days. Through 6 games played in the NBA, Diaz scored 5 points, grabbed 2 rebounds, and dished 1 assist in 18 minutes played. The contract was terminated on January 28, when the team decided not to offer a guaranteed contract for the remainder of the season.

Guillermo Diaz was included on the Summer League roster of the Charlotte Bobcats for the NBA Summer League 2008.

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