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- Larry Allen (born 1971), former American footballer
- Laurie Allen, Manitoba judge
- Leo Allen (born 1972), American stand-up comedian
- Leo E. Allen (1898–1973), American politician
- Les Allen (born 1937), English footballer
- Leslie Allen, several people
- Lester Allen (1891–1949), American screen, stage and vaudeville actor and film director
- Lew Allen (born 1925), former U.S. Air Force general
- Lily Allen (born 1985), English singer-songwriter
- Lou Allen (1924–2008), American footballer
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