| Michael Oldenburg | (1939 - ____) |
| Nicholas Oldenburg | (1969 - ____) |
| Paul_I Oldenburg (King of Greece) | (Dec 14, 1901 - Mar 6, 1964) |
| Paul of_Sparta Oldenburg (Duke) | (1967 - ____) |
| Peter Oldenburg | (1908 - 1980) |
| Sophia of_Greece Oldenburg | (1938 - ____) |
| William George_I of_the_Hellenes Oldenburg (King of Greece) | (Dec 24, 1845 - Mar 18, 1913) |
| Gertrude Ollen | (1916 - ____) |
| Isabel Onley | (____ - ____) |
| Dorothy Beatrix Osborne (Lady) | (1888 - 1946) |
| Irene Ovchinnikov | (1904 - ____) |
| Caroline Paget (Lady) | (____ - 1874) |
| Edith Palairet | (____ - ____) |
| Elizabeth Malet Palk | (____ - 1827) |
| Catherine Parr | (ABT 1512 - Sep 5, 1548) |
| Thomas of_Kendal Parr (Sir) | (____ - ____) |
| William of_Northampton Parr (Marquess) | (____ - ____) |
| William Paston | (____ - ____) |
| Erika Patzek | (1911 - ____) |
| Marie Pavlovna (Grand Duchess) | (1854 - 1920) |
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