Sebastian Ridley-Thomas (born August 12, 1987) is an American politician who served in the California State Assembly.

A Democrat, he represented the 54th Assembly District, which includes the Los Angeles County communities of Century City, Culver City, Westwood, Mar Vista, Palms, Baldwin Hills, Windsor Hills, Ladera Heights, View Park, Crenshaw, Leimert Park, Mid City, and West Los Angeles.

He cited unspecified health problems in his statement and said he would need "an extended period of time to recuperate.

"[5] An Assembly investigation released on January 16, 2019 concluded that Ridley-Thomas likely made an unwanted sexual advance toward a female Capitol staffer two years prior.

[6] On October 13, 2021, the United States Attorney for the Central District of California announced that a federal grand jury had indicted Ridley-Thomas's father and former USC Dean of Social Work Marilyn L. Flynn for "a bribery scheme in which [Sebastian Ridley-Thomas] received substantial benefits from the university in exchange for [Ridley-Thomas's father] supporting county contracts and lucrative contract amendments with the university..."[7][8][9]