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.