- Ogilby, John
- Ogilvie, Charles Atmore
- Ogilvie, James
- Ogle, Chaloner (1681?-1750)
- Ogle, Charles (1775-1858)
- Ogle, Charles Chaloner
- Ogle, George (1704-1746)
- Oglethorpe, Theophilus
- O'Gorman, Maelmuire
- O'Gorman Mahon
- O'Grady, Standish
- Ogston, Francis
- O'Hussey, Mael-Brighde
- O'Kane, Eachmarcach
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- Oldfield, John (1789-1863)
- Oldfield, Joshua
- Oldfield, Thomas (1756-1799)
- Oldmixon, John
- Oley, Barnabas
- Oliver, John (d.1552)
- Oliver, John (1838-1866)
- Oliver, Martha Cranmer
- Oliver, Peter
- Ollier, Edmund
- Olliffe, Joseph Francis
- Ollivant, Alfred
- Oliver, William (1659-1716)
- Oliver, William (1695-1764)
- Oliver, William (1804?-1853)
- See Mahony (Constantine).
- See: Molloy.
- See: Meara.
- See: Meara.
- See O'More, Rory (d. 1578).
- See: O'Maelchonaire.
- See O'Neill, John (1740-1798).
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- Orde, Thomas (Orde-Powlett)
- Orm
- Osbaldeston, William
- Osborn, Elias
- Osborn, George
- Osborn, John
- Osborn, Robert Durie
- Osborn, Sherard
- Osborne, Dorothy. See under Temple, William (1628-1699)
- Osborne, Edward
- Osborne, Francis (1593-1659)
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- Otthen, Hippocrates
- Ottley, William Young
- Otway, Cæsar
- Owen, Aneurin
- Owen, Charles
- Owen, Corbet
- Owen, Jacob
- Owen, James
- Owen, John (1560?-1622)
- Owen, John (1580-1651)
- Owen, Richard (1606-1683)
- Owen, Richard (1804-1892)
- Owen, Robert
- Owen, Samuel
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