Lives listing by occupation: aristocrat
- Pitt, John, 2nd earl of Chatham (born 1756–died 1835), English aristocrat, army officer, regional governor
- Pitt, William, 1st earl of Chatham [the elder] (born 1708–died 1778), English aristocrat, prime minister, politician, member of Parliament
- Podewils, Otto Christoph von, graf von Podewils (born 1719–died 1781), German aristocrat
- Poellnitz, Anne von, baroness von Poellnitz [née Stuart] (born 1746), English aristocrat
- Polcenigo, Giorgio di, conte di Fanna (born 1715–died 1784), Italian aristocrat, poet
- Ponsonby, Henrietta Frances, countess of Bessborough [née Spencer] (born 1761–died 1821), English aristocrat
- Ponsonby, Honourable Sarah (born c. 1755–died 1831), Irish aristocrat
- Portocarrero y Funes de Villalpando, Cristóbal Gregorio, V conde de Montijo (born 1692–died 1763), Spanish aristocrat, diplomat, statesman, civil servant
- Potier, François Joachim Bernard, duc de Gesvres (born 1692–died 1757), French aristocrat, courtier
- Pougny de Guillet, Catherine Josephte de, baronne de Monthoux [née Loras Du Saix] (flourished 1754–1776), French aristocrat
- Pougny de Guillet, François de, baron de Monthoux (born 1705–died 1763), French aristocrat, lawyer
- Pratt, Charles, 1st Earl Camden (born 1714–died 1794), English aristocrat, lawyer, politician, member of Parliament, civil servant
- Pratt, Lady Elizabeth (born 1752–died 1826), English aristocrat
- Prozor, Count Moritz (born 1849–died 1928), Lithuanian aristocrat, diplomat, translator
- Pulteney, Anna Maria, countess of Bath [née Gumley] (born 1694–died 1758), English aristocrat
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