Derrick LeRon Williams (born May 25, 1991) is an American professional basketball player who last played for Panathinaikos of the Greek Basket League and the EuroLeague.

He signed in China to start the 2017–18 season, but joined the Los Angeles Lakers on a 10-day contract in March 2018.

As a freshman in 2009–10, Williams averaged 15.7 points (7th in the Pac-10) and 7.1 rebounds per game, and had a field goal percentage of .575 (2nd in the Pac-10; 12th in the NCAA).

[8] Williams then had a career-high 32 points along with 13 rebounds to lead Arizona in an upset victory over the #1-seeded Duke by a 16-point margin to advance into the Elite Eight,[9] where they fell 65–63 to the future NCAA tournament champion, Connecticut.

[25] Williams participated in the 2012 Rising Stars Challenge, as well as the 2012 NBA All-Star Weekend Slam Dunk Contest.

[29] He made his debut on November 29, 2013, finishing with 12 points (on 6-for-13 shooting), six rebounds and four assists in a 104–96 overtime loss to the Los Angeles Clippers.

In the Kings' 2014–15 season finale on April 15, Williams scored a season-high 22 points in a 122–109 win over the Los Angeles Lakers.

[31] He made his debut for the Knicks in the team's season opener against the Milwaukee Bucks on October 28, scoring a game-high 24 points in a 122–97 win.

[37] That night, Williams played 22 minutes in his debut in Cleveland's 118–109 loss to the Oklahoma City Thunder and scored 12 points, going 3-for-3 from the field and 6-for-8 from the free throw line.

[46] On October 3, 2018, Williams signed with Bayern Munich of the Basketball Bundesliga (BBL) and the EuroLeague for the 2018–19 season.

[51] On June 30, 2021, Williams signed a one-year contract with Maccabi Tel Aviv of the Israeli Basketball Premier League and the EuroLeague.

On July 15, 2022, Williams signed a one-year contract with Panathinaikos of the Greek Basket League and the EuroLeague.