Personal name index: O
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O'Casey | Sean | 1880-1964 | playwright and writer
- Casey | John
- O'Cathasaigh | Seán
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O'Cathasaigh | Seán
- O'Casey | Sean | 1880-1964 | playwright and writer
- Casey | John
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Ogden | Jessie Vera | 1900-1969 | née Bridge | wife of Sir Alwyne Ogden
- Bridge | Jessie Vera
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Ogilvy | David Graham Drummond | 1826-1881 | 5th Earl of Airlie
- Arlie | 5th Earl of
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Oglander | Cecil Faber | Aspinall- | 1878-1959 | Brigadier General
- Aspinall-Oglander | Cecil Faber
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O'Gowan | Eric Edward | 1895-1969 | Major General
- Smith | Eric Edward | Dorman-
- Dorman-Smith | Eric Edward
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Ohren | family
- Ovington | family
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Olafsson | Eggert
- Ólafsson | Eggert | 1726-1768 | Icelandic poet and antiquarian
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Ólafsson | Eggert | 1726-1768 | Icelandic poet and antiquarian
- Olafsson | Eggert
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Olmutz | Paul of
- Olmütz | Paul of | fl before 1468
- Paul of Olmütz
-
Olmütz | Paul of | fl before 1468
- Paul of Olmütz
- Olmutz | Paul of
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Oppe | Thomas Ernest
- Oppé | Thomas Ernest | b 1925 | paediatrician
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Oppé | Thomas Ernest | b 1925 | paediatrician
- Oppe | Thomas Ernest
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Oppenheimer | Barbara Whittingham | fl c 1938-1948 | née Jones | journalist
- Jones | Barbara Whittingham
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Orford | 1st Earl of
- Walpole | Robert | 1676-1745 | 1st Earl of Orford | statesman
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Orford | 2nd Earl of
- Walpole | Robert | ? 1701-1751 | 2nd Earl of Orford
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Orford | 4th Earl of
- Walpole | Horace | 1717-1797 | 4th Earl of Orford | author, antiquary and MP
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Ormonde | 1st Duke of
- Butler | James | 1610-1688 | 1st Duke of Ormonde | soldier and statesman
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Ormsby-Gore | William David
- Gore | William David | Ormsby- | 1918-1985 | 5th Baron Harlech | politician and diplomat
- Harlech | 5th Baron
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Ormsby-Gore | William George Arthur
- Gore | William George Arthur | Ormsby- | 1885-1964 | 4th Baron Harlech | politician
- Harlech | 4th Baron
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Orris
- Ingelow | Jean | 1820-1897 | poet and author
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Orry | Philibert | 1689-1747 | Comte de Vignory | French statesman
- Vignory | Comte de
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Orwell | George
- Blair | Eric Arthur | 1903-1950 | novelist and journalist known as George Orwell
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Orwell | Sonia Mary
- Blair | Sonia Mary | 1918-1980 | née Brownell | second wife of George Orwell (Eric Arthur Blair)
- Brownell | Sonia Mary
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Osborne | Evelyn Alice
- Bridger | Evelyn Alice | fl 1927-1996 | née Osborne | student
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Osborne | Thomas | 1631-1712 | 1st Duke of Leeds | statesman
- Danby | 1st Earl of
- Leeds | 1st Duke of
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Osborne | Thomas | 1713-1789 | 4th Duke of Leeds
- Leeds | 4th Duke of
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O'Shaughnessy | Eileen Maud
- Blair | Eileen Maud | 1905-1945 | née O'Shaughnessy | first wife of Eric Arthur Blair (George Orwell)
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Ossory | 6th Earl of
- Butler | Thomas | 1634-1680 | 6th Earl of Ossory | Vice-Admiral and Irish politician
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Österberg | Martina | 1849-1915 | née Bergman | teacher
- Bergman | Martina
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Overstone and Fotheringay | 1st Baron of
- Loyd | Samuel Jones | 1796-1883 | 1st Baron Overstone of Overstone and Fotheringay | banker
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Ovington | family
- Ohren | family
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Owen of the City of Plymouth | Baron
- Owen | David Anthony Llewellyn | b 1938 | Baron Owen of the City of Plymouth | politician
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Owen | David Anthony Llewellyn | b 1938 | Baron Owen of the City of Plymouth | politician
- Owen of the City of Plymouth | Baron
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Owen | Jean Allan
- Visger | Jean Allan | d 1922 | née Pinder | married firstly George Newton Owen | author and journalist
- Pinder | Jean Allan
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Oxford and Asquith | 1st Earl of
- Asquith | Herbert Henry | 1852-1928 | 1st Earl of Oxford and Asquith | statesman
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Oxford | 17th Earl of
- Vere | Edward | De | 1550-1604 | 17th Earl of Oxford | writer
- De Vere | Edward
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Oxford | 1st Earl of
- Harley | Robert | 1661-1724 | 1st Earl of Oxford | statesman