Dennis Sullivan (disambiguation)

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