Dennis Sullivan (born 1941) is an American mathematician.
Dennis Sullivan may also refer to: Dennis Sullivan (cricketer) (1883–1968), English cricketer Dennis B. Sullivan (1927–2020), U.S. Air Force general Dennis Joseph Sullivan (born 1945), American prelate of the Roman Catholic Church Dennis Mark Sullivan (1841-1917), American businessman and politician Dennis Michael Sullivan, American electrical engineer Dennis T. Sullivan (died 1906), American Chief of the San Francisco Fire Department in 1906 Dennis Sullivan, producer of Pork, a political talk show on the America's Talking network Denny Sullivan (1882–1956), American baseball center fielder Denny Sullivan (third baseman) (1858–1925), American baseball utility player
See also Denis Sullivan (disambiguation) Dennis O'Sullivan (disambiguation)