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 Arthur Allen (born 1973), British convicted murderer, see Gary Allen case
See also
edit- Gary Allan (born 1967), American country music singer.
- Gary Allan (speedway rider) (born 1967), British-born speedway rider from New Zealand