Isaiah Jamar Thomas is an American professional basketball player who is currently a free agent. The 5-foot-9-inch (1.75 m) point guard played three years of college basketball for the Washington Huskies and was a three-time all-conference selection in the Pac-10. After electing to forgo his senior year of college, Thomas was selected by the Sacramento Kings with the final pick in the 2011 NBA draft. He spent three seasons with the Kings before joining the Phoenix Suns in 2014. Thomas was traded to the Boston Celtics in February 2015. He was named an NBA All-Star in both 2016 and 2017, and received All-NBA Team honors for the 2016-17 season where he led the Celtics to the #1 seed of the Eastern Conference. He was traded to the Cleveland Cavaliers in August 2017 before being dealt to the Los Angeles Lakers at mid-season. In July 2018, Thomas joined the Denver Nuggets. He later signed with the Washington Wizards in July 2019, before again being traded mid-season, this time to the Los Angeles Clippers where he was waived shortly after.

Before the 2011 NBA draft, Thomas participated in his own pre-draft documentary entitled "Road To The NBA–The Isaiah Thomas Story". Thomas was selected in the second round of the 2011 NBA draft with the 60th and final pick by the Sacramento Kings. On February 19, 2012, Thomas recorded his first double-double with 23 points and 11 assists against the Cleveland Cavaliers.

On July 12, 2014, Thomas was acquired by the Phoenix Suns in a sign-and-trade deal that also sent the rights of Alex Oriakhi to the Kings. On August 14, 2014, Thomas underwent a successful arthroscopy of his left wrist, for an injury sustained the previous season. He made his debut for the Suns in their victorious 119–99 season opener against the Los Angeles Lakers, in which he recorded 23 points, 3 assists, and 1 rebound. In the Suns' next game on October 31, Thomas again recorded 23 points in a 94–89 win over the San Antonio Spurs, joining Tom Chambers, A.C. Green, and Tom Gugliotta as the fourth Sun to score at least 23 points in their first two games with the team.

On February 19, 2015, Thomas was traded to the Boston Celtics in exchange for Marcus Thornton and a 2016 first-round pick. He made his debut for the Celtics three days later in a 118–111 overtime loss to the Los Angeles Lakers, scoring 21 points off the bench. On March 2, 2015, he was named Eastern Conference Player of the Week for games played Monday, February 23, through Sunday, March 1. He later missed eight games in March with a bruised lower back. On April 8, 2015, he scored a season-high 34 points in a 113–103 win over the Detroit Pistons. He subsequently earned Eastern Conference Player of the Week honors for games played Monday, April 6, through Sunday, April 12. In his first career playoff game on April 19, Thomas recorded 22 points and 10 assists in a first-round Game 1 loss to the Cleveland Cavaliers. The Celtics went on to lose to the Cavaliers in a four-game sweep, as Thomas averaged 17.5 points and 7.0 assists over the series. As a result of his sixth-man role with both Phoenix and Boston in 2014–15, Thomas finished second in the NBA Sixth Man of the Year Award voting with 324 points, including 33 first-place votes.

On August 22, 2017, Thomas was traded, along with Jae Crowder, Ante Žižić, and the Brooklyn Nets' unprotected 2018 first-round draft pick, to the Cleveland Cavaliers in exchange for Kyrie Irving. However, during the post-trade physical examination by Cleveland staff, concerns were raised about the health of Thomas' previously injured hip. As a result, eight days after the deal was announced, the Celtics agreed to send the Cavaliers a 2020 second-round draft pick via the Miami Heat to complete the trade. It was later reported that Thomas had been playing with a number of secondary issues in his hip, such as a loss of cartilage and some arthritis, for several seasons. On September 25, 2017, the Cavaliers said that Thomas might play by the end of the year. On December 21, 2017, Thomas scrimmaged with the Canton Charge of the NBA G League and dressed for the first time since joining the Cavaliers, suiting up but not playing against the Chicago Bulls. On January 2, 2018, Thomas made his long-awaited debut for the Cavaliers, scoring 17 points in 19 minutes off the bench in a 127–110 win over the Portland Trail Blazers. A day later, Thomas returned to TD Garden. Although he did not play in the Cavaliers' 102–88 loss to the Celtics, Thomas received a standing ovation from the Celtics' fans. On January 6, he had 19 points and four assists in his second appearance and first start of the season in a 131–127 win over the Orlando Magic. On January 20, he scored a season-high 24 points in a 148–124 loss to the Oklahoma City Thunder.

On February 8, 2018, the Cavaliers traded Thomas, Channing Frye and a 2018 first-round draft pick to the Los Angeles Lakers in exchange for Jordan Clarkson and Larry Nance Jr. In his debut for the Lakers two days later, Thomas scored 22 points off the bench in a 130–123 loss to the Dallas Mavericks. On March 1, he scored a season-high 29 points in a 131–113 win over the Miami Heat. On March 29, he was ruled out for the rest of the season after undergoing arthroscopic surgery to his right hip.

On July 16, 2018, Thomas signed a one-year deal with the Denver Nuggets. He made his debut for the Nuggets on February 13, 2019, scoring all eight of his points in the third quarter of Denver's 120–118 win over the Sacramento Kings. It was his first game since March 22, 2018, when he was with the Lakers.

On July 10, 2019, Thomas signed with the Washington Wizards.

On February 6, 2020, Thomas was traded to the Los Angeles Clippers as a trade deadline acquisition. He was waived two days later.

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