| OLLYVER, Magdaline | B. 4 AUG 1566 |
| OLMODSSON, Askel |
| OLMSTEAD, John , Doctor |
| OLMSTEAD, Nehemiah |
| OLMSTEAD, Rebecca |
| OLMSTEAD, Richard |
| OLMUTZ, Detlev of , Bishop of Olmutz |
| OLMUTZ, Karl Joseph Habsburg of , Bishop of Olmutz | B. 7 AUG 1649 | D. 27 JAN 1664
| OLOFSDOTTER, Anna | B. BEF. 1491 |
| OLOFSDOTTER, Helena |
| OLSON, Lois | B. Private |
| OLTHAN |
| OLTIGEN, Adelaide of |
| OLTIGEN, Regina of (Neuchatel?) | D. 1107
| OLUFSDATTER, Elsebe | D. 1384
| |
| ONDERDONK, Catherine |
| ONDERDONK, Gertruyt |
| ONECA |
| ONLEY, Edward |
| ONLEY, Isabel |
| ONLEY, Lydia | B. 1645 | D. 9 SEP 1724
| ONLEY, Mary |
| ONSURAIRBE, Adeh |
| OOSTINGE, Roelof |
| OOTHOUT, Abraham | B. ABT. 8 DEC 1733 |
| OOTHOUT, Alida | B. ABT. 19 OCT 1744 |
| OOTHOUT, Cornelis | B. ABT. 7 DEC 1735 |
| OOTHOUT, Evert | B. ABT. 27 JUN 1742 |
| OOTHOUT, Jan Johannes |
| OOTHOUT, Johannes | B. ABT. 6 JAN 1731 |
| |
| OOTHOUT, Maicke | B. ABT. 24 SEP 1732 |
| OOTHOUT, Mayke | B. ABT. 30 APR 1738 |
| OOTHOUT, Myndert | B. ABT. 20 APR 1742 |
| OOY, Daughter of |
| OPHIR |
| OPIJNEN, Aleidis Cecq of |
| OPLADEN, Johann |
| OPLADEN, Maria Gertrud | B. 3 JUL 1856 | D. 15 DEC 1936
| OPLADEN, Peter Theodor |
| OPLADEN, Wilhelm |
| OPOLE, Jadwiga of |
| OPOLSKI, King Wladyslaw I of Upper Silesia | B. ABT. 1225 | D. ABT. 13 NOV 1281
| OPP, Mary | B. ABT. 1633 | D. 20 AUG 1670
| OPPENWEILER, Burkard IX of |
| OPTATUS, Flavius |
| |
| OPUNS |
| ORANGE, Amalie of , Princess of Orange | B. 9 DEC 1581 | D. 28 SEP 1657
| ORANGE, Bernhard Raimbaud of |
| ORANGE, Claudia of Chalons and | D. 31 MAY 1521
| ORANGE, Maria of | B. 7 FEB 1556 | D. OCT 1616
| ORANGE, Renatus of , Prince of Orange | B. 5 FEB 1519 | D. 7 JUL 1544
| ORANGE, Robert |
| ORBAIS, Marie of | D. AFT. AUG 1225
| ORCHAMOS, King of Babylon |
| ORCHARD, Joan | B. ABT. 1458 |
| ORCHARD, John | B. ABT. 1432 | D. 30 AUG 1480
| ORCHARD, Richard |
| ORCHOMENUS |
| ORCUTT, Benjamin |
| ORCUTT, Consider |
| |