After college, he was drafted by the Golden State Warriors and spent five years playing in the National Basketball Association (NBA).

Following his NBA career, Romar finished the 1984–85 season in the Continental Basketball Association (CBA) with the Tampa Bay Thrillers and Evansville Thunder.

[3] With a season-opening win over South Carolina State on November 14, 2014, Romar passed Marv Harshman to become the second-winningest coach in UW history.

[6] However, on March 15, 2017, following a dismal 9–22 season with future #1 pick Markelle Fultz leading the team, Romar was fired as head coach at Washington after 15 years.

[8] On April 16, 2017, it was announced that Romar had joined Sean Miller's staff at Arizona as associate head coach.

[9] On February 24, 2018, Romar was the interim head coach for one game after news broke the previous day that the FBI had reportedly intercepted phone conversations about Miller talking about paying Deandre Ayton to come to Arizona.

Romar was announced as the new head men's basketball coach at Pepperdine on March 12, 2018, returning for his second stint with the school.

[11] On March 24, 2021, Romar's Waves beat Coastal Carolina 84–61 to win the 2021 College Basketball Invitational, securing the program's first-ever postseason championship.

[15] In 2006, he and his wife founded the Lorenzo Romar Foundation for the prevention of domestic violence and educational assistance for disadvantaged youth as well as other charitable causes.