Hubert "Cubby" Selby Jr. (July 23, 1928 – April 26, 2004) was an American writer. His best-known novels are Last Exit to Brooklyn (1964) and Requiem for a Dream (1978), exploring worlds in the New York area. Both novels were adapted later as films, and he appeared in small roles in each.
Selby wrote about a harsh underworld seldom portrayed in literature. His first novel was prosecuted for obscenity in Great Britain in 1967 and banned in Italy, prompting defences from many leading authors such as Anthony Burgess. He was highly influential to more than a generation of writers; for more than 20 years, he taught creative writing at the University of Southern California in Los Angeles, where he lived full-time after 1983.