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- Patrick Allen (1927–2006), British actor
- Paul Allen, several people
- Paul Allen (born 1953), Microsoft founder
- Paul Allen (footballer) (born 1962), English footballer
- Percival Allen (1917–2008), British geologist
- Percy Allen (writer) (1875–1959), English writer on Shakespeare
- Percy Allen (footballer) (1895–1969), English footballer
- Percy Benjamin Allen (1913–1992), New Zealand politician
- Pete Allen (born 1954), English dixieland jazz clarinetist
- Peter Allen (1944–1992), Australian songwriter and singer
- Peter Allen (US broadcaster) (born 1920), American broadcaster and radio announcer
- Peter Anthony Allen (1911–1964), British convicted murderer
- Peter Lewis Allen (author), American scholar and author
- Phil Allen, English rock musician
- Philip Allen (politician) (1785–1865), American politician
- Philip Allen, Baron Allen of Abbeydale (1912–2007), British civil servant
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