Fullmer is a surname. Notable people with the surname include:
Baldwin W. Fullmer (1834–1910), American farmer, politician, newspaper editor and Methodist minister Brad Fullmer (born 1975), American baseball player David Fullmer (1803–1879), American politician, church leader and farmer Don Fullmer (1939–2012), American boxer Gene Fullmer (1931–2015), American boxer John S. Fullmer (1807–1883), American politician and farmer June Zimmerman Fullmer (1920–2000), American historian Randy Fullmer (1950–2023), American businessman Steve Fullmer (born 1946), American-born New Zealand potter
See also Meanings of minor planet names: 20001–21000#373