| Orso ORSINI (BEF 840 - ____) |
| Orso ORSINI (ABT 991 - ABT 1045) |
| Orso ORSINI (ABT 1127 - AFT 1207) |
| Orso ORSINI (ABT 1372 - 28 JUL 1424) |
| Paolo Giordano ORSINI (1st Duke of Bracciano) (1541 - 13 NOV 1585) |
| Paul ORSINI (Pope) (ABT 700 - 28 JUN 767) |
| Pietro ORSINI (ABT 1075 - AFT 27 MAY 1159) |
| Pirro ORSINI (____ - ABT 1420) |
| Raimondo ORSINI (____ - OCT 1459) |
| Riccardo ORSINI (____ - AFT 1309) |
| Richard I ORSINI (Count Palatine) (____ - 1303/04) |
| Rinaldo ORSINI (1217 - 29 MAY 1286) |
| Roberto ORSINI (2nd Count of NOLA) (1294 - 15 JAN 1344/45) |
| Roberto ORSINI (ABT 1360 - 1393) |
| Roberto ORSINI (Count of Tagliacozzo and Alba) (____ - 29 JUN 1479) |
| Romano ORSINI (1st Count of NOLA) (1273 - ABT 1326) |
| Stephen ORSINI (Pope) (ABT 714 - 26 APR 757) |
| Sueva ORSINI (____ - ____) |
| Tarquino ORSINI (ABT 630 - ____) |
| Thomais ORSINI (ABT 1330 - ____) |
| Virginio ORSINI (SEP 1572 - 9 SEP 1615) |
| Anna Maria of ORTENBURG (Countess) (1547 - 16 DEC 1601) |
| Ilka of ORTENBURG (29 JUN 1942 - ____) |
| Rosamunde of ORTENBURG (____ - 1636) |
| Veronika of ORTENBURG (____ - 1573) |
| Aileen OSBORN (25 JUN 1892 - 15 AUG 1979) |
| Anna OSBORN (____ - ____) |
| David OSBORN (____ - ____) |
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