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- P. W. Ellis (died 1929), Toronto Transportation Commission chairman
- Patrick Ellis, brother of the Institute of Brothers of Christian Schools and president of CUA (1992–98)
- Paul Ellis, New Zealand record producer
- Pee Wee Ellis (born 1941), American saxophonist
- Perry Ellis (1940–1986), American fashion designer
- Peter Ellis (architect) (1808–1888), English architect who designed the revolutionary Oriel Chambers in Liverpool in 1864
- Peter Ellis (CHP politician), candidate of the Christian Heritage Party of Canada
- Peter Ellis (Green Party candidate), candidate of the Green Party of Canada
- Peter Berresford Ellis (born 1943), English historian and literary biographer
- Peter Hugh McGregor Ellis (born 1958), New Zealander who was convicted of child molestation in 1993 and served seven years in jail
- Powhatan Ellis (1790–1863), US senator from Mississippi
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