| Oppenheim-Barnes (Barony) |
Sally Oppenheim-Barnes - Thu 9th Feb 1989
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- |
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| Oram (Barony) |
Albert Edward Oram - Thu 22nd Jan 1976
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4 September 1999 |
- |
| Oranmore and Browne (Barony) |
Dominick Browne - Wed 4th May 1836
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- |
- |
| of Orford (Earldom) |
Robert Walpole - Tue 6th Feb 1742
|
2 March 1797 |
- |
| of Orford (Earldom) |
Horatio Walpole - Thu 10th Apr 1806
|
27 September 1931 |
- |
| of Orford (Earldom) |
Edward Russell - Tue 7th May 1697
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- |
- |
| Oriel (Barony) |
John Foster - Tue 17th Jul 1821
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- |
- |
| Oriel (Barony) |
Margaretta Amelia Foster - Sat 5th Jun 1790
|
- |
- |
| of Orkney (Earldom) |
George Hamilton - Tue 3rd Jan 1696
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- |
- |
| Ormathwaite (Barony) |
John Benn Walsh - Thu 16th Apr 1868
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8 March 1984 |
- |
| Orme (Barony) |
Stanley Orme - Tue 21st Oct 1997
|
28 April 2005 |
- |
| of Ormelie (Earldom) |
John Campbell - Mon 12th Sep 1831
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8 November 1862 |
- |
| of Ormelie (Earldom) |
Gavin Campbell - Sat 11th Jul 1885
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19 October 1922 |
- |
| of Ormond (Marquessate) |
Walter Butler - Fri 12th Jan 1816
|
10 August 1820 |
- |
| of Ormond (Marquessate) |
James Wandesford Butler - Wed 5th Oct 1825
|
25 October 1997 |
- |
| of Ormond (Marquessate) |
James Butler - Sat 30th Aug 1642
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- |
- |
| of Ormond (Dukedom) |
James Butler - Mon 9th Nov 1682
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- |
- |
| of Ormond (Dukedom) |
James Butler - Wed 30th Mar 1661
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- |
- |
| Ormonde (Barony) |
James Wandesford Butler - Tue 17th Jul 1821
|
25 October 1997 |
- |
| of Orrery (Earldom) |
Roger Boyle - Sun 5th Sep 1660
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