Letters Patent for the United Kingdom
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By title: O
All letters patent for United Kingdom
| Kingdom | Reign | Issued on | Peerage types | Peerages | Issued to |
|---|---|---|---|---|---|
| United Kingdom | Elizabeth II | Mon 1st May 2000 | Life peerage: Life Peerages Act 1958 | Oakeshott of Seagrove Bay | OAKESHOTT Matthew Alan |
| United Kingdom | William IV | Sat 10th Sep 1831 | Hereditary peerage | Oakley | CADOGAN George |
| United Kingdom | George VI | Mon 13th Jan 1947 | Hereditary peerage | Oaksey | LAWRENCE Geoffrey |
| United Kingdom | Elizabeth II | Fri 21st Aug 1964 | Life peerage: Life Peerages Act 1958 | Oakshott | OAKSHOTT Hendrie Dudley |
| United Kingdom | Elizabeth II | Mon 5th Oct 2015 | Life peerage: Life Peerages Act 1958 | Oates | OATES Jonathan |
| United Kingdom | Victoria | Sat 16th Jun 1900 | Hereditary peerage | O'Brien | O'BRIEN Peter |
| United Kingdom | Elizabeth II | Wed 14th Mar 1973 | Life peerage: Life Peerages Act 1958 | O'Brien of Lothbury | O'BRIEN Leslie Kenneth |
| United Kingdom | Elizabeth II | Fri 21st Jun 1991 | Life peerage: Life Peerages Act 1958 | O'Cathain | O'CATHAIN Detta |
| United Kingdom | Victoria | Sat 30th Jun 1838 | Promotion | Ockham | KING William |
| United Kingdom | Elizabeth II | Tue 10th Jan 2012 | Life peerage: Life Peerages Act 1958 | O'Donnell | O'DONNELL Augustine Thomas |
| United Kingdom | Elizabeth II | Wed 13th Oct 2021 | Life peerage: Life Peerages Act 1958 | Offord of Garvel | OFFORD Malcolm Ian |
| United Kingdom | George VI | Mon 10th Jul 1950 | Hereditary peerage | Ogmore | REES-WILLIAMS David Rees |
| 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 | George V | Sat 9th Feb 1924 | Hereditary peerage | Olivier | OLIVIER Sydney Haldane |
| United Kingdom | Elizabeth II | Fri 5th Mar 1971 | Life peerage: Life Peerages Act 1958 | Olivier | OLIVIER Laurence Kerr |
| 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 |
| United Kingdom | Elizabeth II | Thu 25th Feb 1999 | Life peerage: Life Peerages Act 1958 | O'Neill of Bengarve | O'NEILL Onora Sylvia |