Thomas Rex Lee (born December 28, 1964) is a former American jurist who was a justice of the Utah Supreme Court from 2010 to 2022.

[6] After law school, Lee clerked for J. Harvie Wilkinson III of the U.S. Court of Appeals for the Fourth Circuit from 1991 to 1992.

He then entered private practice at the Salt Lake City-based law firm of Kimball, Parr, Waddoups, Brown & Gee, taking a one-year leave of absence to serve as a law clerk for Justice Clarence Thomas of the U.S. Supreme Court from 1994 to 1995.

After his Supreme Court clerkship, Lee entered private practice at the Salt Lake City law firm Kimball, Parr, Waddoups, Brown & Gee.

[2] During his years as a full-time law professor, Lee was also of counsel at Howard, Phillips, & Andersen, handling intellectual property litigation.

[8][9] Lee took leave of the JRCL from 2004 to 2005 to serve as Deputy Assistant Attorney General in the Civil Division of the United States Justice Department.

[8][10] While at the JRCL, from 2002 to 2004, Lee also served as the lead counsel in cases brought by the state of Utah in relation to plans to put nuclear waste on the Goshute Indian Reservation.

[13] Lee was sworn into office on July 19, 2010; his mentor, U.S. Supreme Court Justice Clarence Thomas, administered the oath.

[16][19] A 2016 paper written by Jeremy Kidd of the Mercer University Walter F. George School of Law and others attempted to measure the "Scalia-ness" of various potential nominees to the Supreme Court to fill the seat left vacant by Antonin Scalia's death.