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- William Jackson Palmer (1836–1909) Civil War general, railroad developer, and philanthropist, born in Leipsic
- John Patten (1746–1800), General Assembly and U.S. Representative from Delaware
- Samuel Paynter (1768–1845), General Assembly and Governor of Delaware
- William Peery (1743–1800), General Assembly and Continental Congressman from Delaware.
- John B. Penington (1825–1902), Attorney General and U. S. Representative from Delaware
- Simeon S. Pennewill (1867–1935), General Assembly and Governor of Delaware
- Russell W. Peterson (born 1916), scientist and Governor of Delaware
- Ryan Phillippe (born 1974), actor; born in New Castle
- Aubrey Plaza (born 1984), actress/comedienne, April Ludgate on Parks and Recreation
- David Plouffe (born 1967), Senior Adviser to the Obama administration; born in Wilmington
- Albert F. Polk (1869–1955), lawyer and U.S. Representative from Delaware
- Charles Polk, Jr. (1788–1857), General Assembly and Governor of Delaware
- Teri Polo (born 1969), actress; born in Dover
- James Ponder (1819–1897), General Assembly and Governor of Delaware
- Bill Press (born 1940), talk radio host, liberal commentator, author
- Howard Pyle (1853– 1911), illustrator and author of books for young people
- Joe Pyne, broadcaster
Read more about this topic: List Of People From Delaware