- O'Duinn, Gillananaemh
- O'Farrelly, Feardorcha
- O'Ferrall, Richard More
- Offa (fl.709)
- Offa (d.796)
- Offley, Thomas
- Offor, George
- Offord, Andrew
- Offord, John de
- O'Fihely, Maurice
- O'Flaherty, Roderic
- Oftfor
- Ogborne, David
- Ogborne, Elizabeth
- Ogborne, John
- Ogden, James
- Ogden, Jonathan Robert
- Ogden, Samuel (1626?-1697)
- Ogden, Samuel (1716-1778)
- Ogilby, John
- Ogilvie, Charles Atmore
- Ogilvie, James
- Ogilvie, John (1580?-1615)
- Ogilvie, John (1733-1813)
- Ogilvie, John (1797-1867)
- Ogilvie, William
- Ogilvy, Alexander (d.1456)
- Ogilvy, Alexander (d.1727)
- Ogilvy, David
- Ogilvy, George (d.1663)
- Ogilvy, George (fl.1634-1679)
- Ogilvy, James (d.1605)
- Ogilvy, James (1593?-1666)
- Ogilvy, James (1615?-1704?)
- Ogilvy, James (1664-1730)
- Ogilvy, James (1714?-1770)
- Ogilvy, John
- Ogilvy, Patrick
- Ogilvy, Walter
- O'Glacan, Nial
- Oglander, John
- Ogle, Chaloner
- Ogle, Charles (1775-1858)
- Ogle, Charles Chaloner
- Ogle, George (1704-1746)
- Ogle, George (1742-1814)
- Ogle, James Adey
- Ogle, John (1569-1640)
- Ogle, John (1647?-1685?)
- Ogle, Owen
- Ogle, Robert de
- Ogle, Robert (d.1469)
- Oglethorpe, James Edward
- Oglethorpe, Owen
- Oglethorpe, Theophilus
- O'Gorman, Maelmuire
- O'Gorman Mahon
- O'Grady, Standish
- Ogston, Francis
- O'Hagan, John
- O'Hagan, Thomas
- O'Haingli, Donat
- O'Halloran, Joseph
- O'Halloran, Sylvester
- O'Halloran, Thomas Shuldham
- O'Hanlon, Redmond
- O'Hara, Charles (1640?-1724)
- O'Hara, Charles (1740?-1802)
- O'Hara, James
- O'Hara, Kane
- O'Hartagain, Cineth
- O'Hearn, Francis
- O'Hely, Patrick
- O'Hempsy, Denis
- O'Heney, Matthew
- O'Higgin, Teague
- O'Higgins, Ambrosio
- Ohthere
- O'Hurley, Dermot
- O'Hussey, Eochaidh
- O'Hussey, Mael-Brighde
- O'Kane, Eachmarcach
- Oke, George Colwell
- O'Kearney, John
- O'Keefe, Eoghan
- O'Keeffe, John
- O'Kelly, Charles
- O'Kelly, Dennis
- O'Kelly, Joseph
- O'Kelly, Patrick
- O'Kelly, Ralph
- Okely, Francis
- Okeover, John
- Okes, Richard
- Okey, John
- Okey, Samuel
- Okham, John de
- Oking, Robert
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- Olaf Godfreyson
- Olaf Sitricson
- Olaf the Black
- Old, John
- Oldcastle, John
- Oldcorne, Edward
- Olde, John
- Oldenburg, Henry
- Oldfield, Anne
- Oldfield, Henry George
- Oldfield, John (1627?-1682)
- Oldfield, John (1789-1863)
- Oldfield, Joshua
- Oldfield, Thomas (1755-1799)
- Oldfield, Thomas Hinton Burley
- Oldhall, William
- Oldham, Hugh
- Oldham, John (1600?-1636)
- Oldham, John (1653-1683)
- Oldham, John (1779-1840)
- Oldham, Nathaniel
- Oldham, Thomas
- Oldis. [See Oldys.]
- Oldisworth, Giles
- Oldisworth, Michael
- Oldisworth, William
- Oldmixon, John
- Oldys, Valentine
- Oldys, William
- O'Leary, Arthur
- O'Leary, Ellen
- O'Leary, Joseph
- Oley, Barnabas
- Olifard, William
- Oliphant, Carolina
- Oliphant, Francis Wilson
- Oliphant, James
- Oliphant, Laurence (d.1500?)
- Oliphant, Laurence (d.1566)
- Oliphant, Laurence (1529-1593)
- Oliphant, Laurence (1691-1767)
- Oliphant, Laurence (1829-1888)
- Oliphant, Thomas
- Oliphant, William (d.1329)
- Oliphant, William (1561-1628)
- Oliver of Malmesbury
- Oliver (d.1219)
- Oliver, Andrew
- Oliver, Archer James
- Oliver, George (1781-1861)
- Oliver, George (1782-1867)
- Oliver, Isaac
- Oliver, John (d.1552)
- Oliver, John (1616-1701)
- Oliver, John (1838-1866)
- Oliver, Martha Cranmer
- Oliver, Peter
- Oliver, Richard
- Oliver, Robert Dudley
- Oliver, Thomas (d.1624)
- Oliver, Thomas (1725-1799)
- Oliver, Thomas (1734-1815)
- Oliver, Tom
- Oliver, William (1659-1716)
- Oliver, William (1695-1764)
- Oliver, William (1804?-1853)
- Olivers, Thomas
- Ollier, Charles
- Ollier, Edmund
- Olliffe, Joseph Francis
- Ollivant, Alfred
- Ollyffe, John
- O'Lochlainn, Domhnall
- O'Lochlainn, Muircheartach
- O'Loghlen, Colman Michael
- O'Loghlen, Michael
- O'Lothchain, Cuan
- O'Maelchonaire, Fearfeasa
- O'Mahony, Connor (fl. 1650).
- See Mahony (Constantine).
- See: Molloy.
- See: Meara.
- See: Meara.
- See O'More, Rory (d. 1578).
- See: O'Maelchonaire.
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- See O'Neill, John (1740-1798).
- O'Neill, Con Bacach
- O'Neill, Daniel
- O'Neill, Eliza See Becher, Eliza, Lady.
- O'Neill, Felim See O'Neill, Sir Phelim.
- O'Neill, Flaithbheartach
- O'Neill, Henry (d.1392)
- O'Neill, Henry (d.1489)
- O'Neill, Henry (1800-1880)
- O'Neill, Hugh (d.1230)
- O'Neill, Hugh (1540?-1616)
- O'Neill, Hugh (fl.1642-1660)
- O'Neill, Hugh (1784-1824)
- O'Neill, John (1740-1798)
- O'Neill, John (1777?-1860?)
- O'Neill, Neill
- O'Neill, Owen (1380?-1456)
- O'Neill, Owen Roe
- O'Neill, Phelim
- O'Neill, Shane
- O'Neill, Turlough Luineach
- O'Neill, William Chichester
- Onslow, Arthur
- Onslow, George (1731-1792)
- Onslow, George (1731-1814)
- Onslow, George (1784-1853)
- Onslow, Richard (1528-1571)
- Onslow, Richard (1601-1664)
- Onslow, Richard (1654-1717)
- Onslow, Richard (1741-1817)
- Onwhyn, Thomas
- Opicius, Johannes
- Opie, Amelia
- Opie, John
- O'Quinn, Jeremiah
- Oram, William
- Orcheyerd, William
- Ord, Craven
- Ord, Harry St. George
- Ord, John Walker
- Ord, Robert
- Orde, John
- Orde, Thomas (Orde-Powlett)
- Ordericus Vitalis
- Ordgar
- Ordish, Rowland Mason
- O'Reilly, Alexander
- O'Reilly, Andrew
- O'Reilly, Edmund (1606-1669)
- O'Reilly, Edmund Joseph
- O'Reilly, Edward
- O'Reilly, Hugh
- O'Reilly, John Boyle
- O'Reilly, Miles
- O'Reilly, Myles William Patrick
- O'Reilly, Philip MacHugh
- Orem, William
- Orford, Earls of
- Orford, Robert
- Orger, Mary Ann
- Oriel, Lord
- Orivalle, Hugh de
- Orkney, Earls of
- Orleans, Duchess of
- Orlton, Adam
- Orm
- Orme, Daniel
- Orme, Robert
- Orme, William
- Ormerod, Edward Latham
- Ormerod, George (1785-1873)
- Ormerod, George Wareing
- Ormerod, Oliver
- Ormerod, William Piers
- Ormesby, William de
- Ormonde, James
- Ornsby, George
- Ornsby, Robert
- O'Rourke, Brian-na-Murtha
- O'Rourke, Tiernan
- Orr, Hugh
- Orr, James
- Orr, John
- Orr, William
- Orridge, Benjamin Brogden
- Ortelius, Abraham
- Orton, Job
- Orton, Reginald
- Orum, John
- Osbald
- Osbaldeston, George
- Osbaldeston, Lambert
- Osbaldeston, Richard
- Osbaldeston, William
- Osberht
- Osbern (fl.1090)
- Osbern (d.1103)
- Osbern, Claudianus
- Osborn Wyddel
- 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)
- Osborne, Francis (1751-1799)
- Osborne, George Alexander
- Osborne, Henry
- Osborne, Peregrine
- Osborne, Peter
- Osborne, Ralph Bernal
- Osborne, Ruth
- Osborne, Sidney Godolphin
- Osborne, Thomas (1631-1712)
- Osborne, Thomas (d.1767)
- Osborne, William
- Osbrith
- Osburga
- Osgar
- Osgith
- Osgodby, Adam de
- Osgod Clapa
- Osgoode, William
- O'Shanassy, John
- O'Shaughnessy, Arthur William Edgar
- O'Shaughnessy, William (1674-1744)
- O'Shaughnessy, William Brooke
- Oshere
- Oskytel
- Oslac
- Osler, Edward
- Osmund (fl.758)
- Osmund (fl.803)
- Osmund (d.1099)
- Osred (697?-716)
- Osred (d.792)
- Osric (d.634)
- Osric (d.729)
- Ossian
- Ossington, Viscount. [See Denison, John Evelyn, 1800-1873.]
- Ossory, Earls of
- Ossory, Lord of. [See Cearbhall, d. 888.]
- Ostler, William
- Ostrith
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- O'Sullivan, Donall
- O'Sullivan, John
- O'Sullivan, Mortimer
- O'Sullivan, Philip
- Oswald (605?-642)
- Oswald (d.972)
- Oswald (fl.1010)
- Oswald (d.1437)
- Oswald, James
- Oswald, John (d.1793)
- Oswald, John (1771-1840)
- Oswald, Richard
- Oswell, William Cotton
- Oswen, John
- Oswestry, Lord of
- Oswin
- Oswulf (d.758)
- Oswulf (d.1067)
- Oswy
- Oswyn
- Osyth
- Othere
- O'Toole, Adam Duff
- O'Toole, Bryan
- O'Toole, Laurence
- Otterby, John
- Otter, William
- Otterbourne, Nicholas
- Otterbourne, Thomas
- Otterburne, Adam
- Otthen, Hippocrates
- Ottley, William Young
- Otway, Cæsar
- Otway, Robert Waller
- Otway, Thomas (1652-1685)
- Otway, Thomas (1616-1693)
- Oudart, Nicholas
- Oudney, Walter
- Oudoceus
- Oughton, James Adolphus Dickenson
- Oughtred, William
- Ould, Fielding
- Ouseley, Frederick Arthur Gore
- Ouseley, Gideon
- Ouseley, Gore
- Ouseley, Ralph
- Ouseley, William (1767-1842)
- Ouseley, William Gore
- Outram, Benjamin (1764-1805)
- Outram, Benjamin Fonseca
- Outram, George
- Outram, James
- Outram, William
- Ouvilly, George Gerbier
- Ouvry, Frederic
- Overall, John
- Overall, William Henry
- Overbury, Thomas
- Overend, Marmaduke
- Overton, Charles
- Overton, Constantine
- Overton, John (1640-1708?)
- Overton, John (1763-1838)
- Overton, John (1764-1838)
- Overton, Richard
- Overton, Robert
- Overton, William
- Owain ap Edwin
- Owain ap Cadwgan
- Owain Gwynedd
- Owain Brogyntyn
- Owain Cyveiliog
- Owain, Gutyn
- Owain (1741-1814)
- Owen of Wales
- Owen (1359?-1416?)
- Owen, Alice
- Owen, Aneurin
- Owen, Charles
- Owen, Corbet
- Owen, David (d.1642)
- Owen, David (1720-1749)
- Owen, David (1784-1841)
- Owen, David (1794-1866)
- Owen, Edward (1728-1807)
- Owen, Edward Campbell Rich
- Owen, Edward Pryce
- Owen, Ellis
- Owen, Francis Philip Cunliffe-
- Owen, George (d.1558)
- Owen, George (1552-1613)
- Owen, George (d.1665)
- Owen, Goronwy
- Owen, Griffith
- Owen, Henry (1716-1795)
- Owen, Henry Charles Cunliffe-
- Owen, Hugh (1615-1686)
- Owen, Hugh (1639-1700)
- Owen, Hugh (1761-1827)
- Owen, Hugh (1784-1861)
- Owen, Hugh (1804-1881)
- Owen, Humphrey
- Owen, Jacob
- Owen, James
- Owen, John (1560?-1622)
- Owen, John (1580-1651)
- Owen, John (1600-1666)
- Owen, John (1616-1683)
- Owen, John (1766-1822)
- Owen, John (1821-1883)
- Owen, Josiah
- Owen, Lewis (d.1555)
- Owen, Lewis (1572-1633)
- Owen, Morgan
- Owen, Nicholas (d.1606)
- Owen, Nicholas (1752-1811)
- Owen, Richard (1606-1683)
- Owen, Richard (1804-1892)
- Owen, Robert (1771-1858)
- Owen, Robert Dale
- Owen, Roger
- Owen, Samuel
- Owen, Thankfull
- Owen, Thomas (d.1598)
- Owen, Thomas (1557-1618)
- Owen, Thomas (1749-1812)
- Owen, William (1469?-1574)
- Owen, William (1530?-1587)
- Owen, William (1769-1825)
- Owen, William Fitzwilliam
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