Gaddis is a surname. Notable people with the surname include:
C. J. Gaddis (born 1985), America football player Christian Gaddis (born 1984), American football player Gadabout Gaddis (1896-1986), American television fisherman Hunter Gaddis (born 1998), American baseball player John Lewis Gaddis (born 1941), American historian of the Cold War Miranda Gaddis, American crime victim Thomas E. Gaddis (1908–1984), American author Vincent Gaddis (1913–1997), American author William Gaddis (1922-1998), American novelist
See also Gaddis Smith (1932-2022), American historian