Letters Patent
Navigate by the first letter of the Peerage title
By title: O
| Kingdom | Reign | Issued on | Peerage types | Peerages | Issued to |
|---|---|---|---|---|---|
| Kingdom of Ireland | William IV | Thu 6th Jan 1831 | Hereditary peerage subsidiary to another created by the same letters patent | O'Grady | O'GRADY Standish |
| United Kingdom | Charles III | Fri 9th Dec 2022 | Life peerage: Life Peerages Act 1958 | O'Grady of Upper Holloway | O'GRADY Frances Lorraine Maria |
| United Kingdom | Victoria | Tue 14th Jun 1870 | Hereditary peerage | O'Hagan | O'HAGAN Thomas |
| United Kingdom | Elizabeth II | Fri 31st Jan 1986 | Life peerage: Appellate Jurisdiction Act 1876 | Oliver of Aylmerton | OLIVER Peter Raymond |
| United Kingdom | Elizabeth II | Fri 5th Mar 1971 | Life peerage: Life Peerages Act 1958 | Olivier | OLIVIER Laurence Kerr |
| United Kingdom | George V | Sat 9th Feb 1924 | Hereditary peerage | Olivier | OLIVIER Sydney Haldane |
| United Kingdom | Elizabeth II | Fri 11th Sep 2009 | Life peerage: Life Peerages Act 1958 | O'Loan | O'LOAN Nuala Patricia |
| United Kingdom | Victoria | Sat 18th Apr 1868 | Hereditary peerage | O'Neill | O'NEILL William |
| Kingdom of Ireland | George III | Thu 28th Aug 1800 | Promotion in the peerage of Ireland | O'Neill | O'NEILL Charles Henry |
| Kingdom of Ireland | George III | Fri 25th Oct 1793 | Peerage of Ireland | O'Neill | O'NEILL John |
| Kingdom of Ireland | George III | Sat 3rd Oct 1795 | Promotion in the peerage of Ireland | O'Neill | O'NEILL John |
| United Kingdom | Elizabeth II | Thu 25th Feb 1999 | Life peerage: Life Peerages Act 1958 | O'Neill of Bengarve | O'NEILL Onora Sylvia |
| United Kingdom | Charles III | Mon 7th Nov 2022 | Life peerage: Life Peerages Act 1958 | O'Neill of Bexley | O'NEILL Teresa Ann Jude |
| United Kingdom | Elizabeth II | Tue 14th Jun 2005 | Life peerage: Life Peerages Act 1958 | O'Neill of Clackmannan | O'NEILL Martin John |
| United Kingdom | Elizabeth II | Thu 28th May 2015 | Life peerage: Life Peerages Act 1958 | O'Neill of Gatley | O'NEILL Terence James |
| United Kingdom | Elizabeth II | Fri 23rd Jan 1970 | Life peerage: Life Peerages Act 1958 | O'Neill of the Maine | O'NEILL Terence Marne |
| Kingdom of Ireland | George III | Tue 30th Jul 1776 | Peerage of Ireland | Ongley | HENLEY ONGLEY Robert |
| United Kingdom | George III | Fri 19th Jun 1801 | Promotion | Onslow | ONSLOW George |
| Kingdom of Great Britain | George I | Fri 19th Jun 1716 | Hereditary peerage | Onslow | ONSLOW Richard |
| United Kingdom | Elizabeth II | Fri 31st Oct 1997 | Life peerage: Life Peerages Act 1958 | Onslow of Woking | ONSLOW Cranley Gordon Douglas |