Constituencies: O
8 constituencies
| Constituency | Member of Parliament | Party | MP since |
|---|---|---|---|
| Old Bexley and Sidcup | Mr Louie French | Conservative | 2 December 2021 |
| Oldham East and Saddleworth | Debbie Abrahams | Labour | 13 January 2011 |
| Oldham West, Chadderton and Royton | Jim McMahon | Labour (Co-op) | 3 December 2015 |
| Orkney and Shetland | Mr Alistair Carmichael | Liberal Democrat | 7 June 2001 |
| Orpington | Gareth Bacon | Conservative | 12 December 2019 |
| Ossett and Denby Dale | Jade Botterill | Labour | 4 July 2024 |
| Oxford East | Anneliese Dodds | Labour (Co-op) | 8 June 2017 |
| Oxford West and Abingdon | Layla Moran | Liberal Democrat | 8 June 2017 |