Pynchon is an English surname. Notable people with the surname include:
People Adeline Lobdell Pynchon (1887–1975), American author, art dealer and collector (1853–1914), American otolaryngologist George M. Pynchon (1862–1940), American yacht racer Thomas Pynchon (born 1937), American novelist William Pynchon (1590–1662), English colonial settler and founder of Springfield, Massachusetts William Pynchon Stewart Ventress (1854–1911), American politician in Mississippi
Fictional characters Margaret Pynchon, portrayed by Nancy Marchand on Lou Grant Stephen Pynchon, portrayed by Malcolm McDowell on Pearl
See also Pinchon, French surname