J
- Jack Allen, several people
- James Allen, several people
- Jennifer Allen, American author
- Jermaine Allen (born 1983), English American footballer
- Jimmy Allen (born 1952), former American football player
- Jimmy Allen (musician), member of American rock band Against All Will
- Joan Allen (born 1956), American actress
- Joel Asaph Allen (1838–1921), American zoologist
- John Allen, several people
- Joseph Allen, several people
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