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- Pat Mills, British cartoonist
- Patrick Mills (born 1988), Australian basketball player
- Paul Mills, figure skater
- Pauline Mills McGibbon (1910–2001), Canadian politician
- Percy Joseph "P.J." Mills (born 1934), Louisiana politician
- Peter Mills (American politician) (born 1943), American politician from Maine
- Peter Mills (UK politician) (1921–1993), British Conservative Member of Paraliament for Devon West
- Phil Mills (born 1963), Welsh rally co-driver
- Phoebe Mills (born 1972), American gymnast and athlete
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