Richard O'Sullivan (1944–2026) was a British actor.
Richard (or Dick) O'Sullivan may also refer to:
Richard O'Sullivan (filmmaker) (born 1968), American screenwriter, director, actor, producer, cinematographer, film editor, radio personality, and founder of Lost Colony Entertainment Richard O'Sullivan (teacher) (1826–1889), teacher and school inspector in Auckland Dick O'Sullivan, Irish boy featured on programme five of On the Street Where You Live Dick O'Sullivan, interim manager of Punchestown Racecourse
See also Richard Sullivan (disambiguation) Rick O'Sullivan, the co-owner of Think Big (horse)