Justin Louis Thomas (born April 29, 1993) is an American professional golfer who plays on the PGA Tour and is a former world number one.

In 2015, Thomas collected seven top-10s and 15 top-25s, with fourth-place finishes at the Quicken Loans National and Sanderson Farms Championship as his best results.

He finished 32nd at the PGA Tour's FedEx Cup, losing the Rookie of the Year award to Daniel Berger.

On November 1, 2015, Thomas earned his first victory on the PGA Tour by winning the CIMB Classic in Kuala Lumpur, Malaysia, by a single stroke over Adam Scott.

[10] In the following week's tournament, the Sony Open in Hawaii, Thomas became the seventh player in PGA Tour history to shoot a 59.

In the fourth round, he played alongside Brian Harman in the final grouping, the first time he had done that in a major championship.

[13] At the Dell Technologies Championship, Thomas became just the fourth golfer to win five times, including a major, in a PGA Tour season since 1960 before his 25th birthday, joining Jack Nicklaus, Tiger Woods, and Jordan Spieth.

[14][15] After finishing runner-up to Xander Schauffele at the Tour Championship, Thomas became the FedEx Cup champion on September 24, 2017.

[17] In February 2018, Thomas won for the eighth time on tour, claiming victory at The Honda Classic in Palm Beach Gardens, Florida.

Thomas had another chance to claim the top spot in the world later on in March at the WGC-Match Play, but he was beaten 3 & 2 by Bubba Watson in the semi-finals.

The result extended his lead at the top of the FedEx Cup standings and reduced the gap on the world number one, Dustin Johnson.

[24] In December 2019, Thomas played on the U.S. team at the 2019 Presidents Cup at Royal Melbourne Golf Club in Australia.

[25] On January 5, 2020, Thomas won the Sentry Tournament of Champions at Kapalua Resort in Maui, Hawaii for the second time.

[26] On August 2, 2020, Thomas won the WGC-FedEx St. Jude Invitational at TPC Southwind in Tennessee by three strokes over four other players.

[27] In March 2021, Thomas shot a final round four-under par 68 to win the 2021 Players Championship by one stroke over Lee Westwood.

[29] Thomas qualified for the U.S. team at the 2022 Presidents Cup; he won all four matches paired with Jordan Spieth but lost in the singles.

[30] In September 2023, Thomas played on the U.S. team in the 2023 Ryder Cup at Marco Simone Golf and Country Club in Guidonia, Rome, Italy.

[31] On January 9, 2021, during the third round of the Sentry Tournament of Champions in Hawaii, Thomas drew criticism for using a homophobic slur to express anger over a missed putt.

[32] Despite Thomas expressing contrition over the incident, describing his language as "inexcusable", sponsors Ralph Lauren and Woodford Reserve ended their relationships with him.