Gary Allen (1936–1986) was an American conservative writer.
Gary Allen may also refer to:
Gary Allen (gridiron football) (1960–2023), American football player Gary Allen (runner) (born 1957), American long-distance runner, Gary Allen (cricketer) (1945–2022), New Zealand cricketer Gary Allen (art director) (1936–2018), American-Canadian art director Gary Arthur Allen (born 1973), British convicted murderer, see Gary Allen case
See also Gary Allan (born 1967), American country music singer. Gary Allan (speedway rider) (born 1967), British-born speedway rider from New Zealand