List of announcement systems by National Rail stations – O
| Station | Station Managed By | CIS Managed By | System | Years | Voice | Platforms | Details |
|---|---|---|---|---|---|---|---|
| Oakengates | |||||||
| Oakham | |||||||
| Oakleigh Park | |||||||
| Oban | |||||||
| Ockendon | |||||||
| Ockley | Southern | Southern | Amey | 2002 to 2018 | Celia Drummond | 2 | |
| Phil Sayer | 1 | ||||||
| Worldline | 2018 to Current | Anne Jermy | 1 | ||||
| Matthew Streeton | 2 | ||||||
| Okehampton | Great Western Railway | Great Western Railway | Worldline | 2021 to Current | Anne Jermy | 3 | |
| Old Hill | |||||||
| Old Roan | Merseyrail | Merseyrail | None | Generic Announcements Only | |||
| Old Street | London Underground | Great Northern | Worldline | 2012 to Current | Anne Jermy | 3, 4 | |
| Oldfield Park | |||||||
| Olton | |||||||
| Ore | Southern | Southern | Worldline | 2018 to Current | Anne Jermy | 1 | |
| Matthew Streeton | 2 | ||||||
| Ormskirk | Merseyrail | Merseyrail | None | Generic Announcements Only | |||
| Orpington | Southeastern | Southeastern | Infomat | 1982 to 2002 | Angela Peberdy | 1-2, 3-4, 5-6, 7-8 | |
| Julie Berry | |||||||
| Robert Lister | |||||||
| Worldline | 2002 to 2005 | Anne Jermy | 1-2, 3-4, 5-6, 7-8 | ||||
| Thales | 2005 to 2012 | Pauline Cavilla | 1-2, 3-4, 5-6, 7-8 | ||||
| Infotec | 2012 to 2013 | Acapela Rachel | 1-2, 3-4, 5-6, 7-8 | ||||
| Worldline | 2013 to Current | Anne Jermy | 1-2, 5-6 | ||||
| Rob | 3-4, 7-8 | ||||||
| Orrell | Northern | Northern | Worldline | 20?? to 2018 | Anne Jermy | Global | |
| KeTech | 2018 to Current | Celia Drummond | Global | ||||
| Orrell Park | Merseyrail | Merseyrail | None | Generic Announcements Only | |||
| Otford | |||||||
| Oulton Broad North | |||||||
| Oulton Broad South | |||||||
| Outwood | Northern | Northern | Funkwerk | 2008 to 2015 | Phil Sayer | Global | |
| KeTech | 2015 to Current | Celia Drummond | Global | ||||
| Overpool | Merseyrail | Merseyrail | None | Generic Announcements Only | |||
| Overton | |||||||
| Oxenholme Lake District | Avanti West Coast | Avanti West Coast | Ditra | 1994 to 2006 | Unknown Female | Global | |
| Amey | 2006 to 2018 | Only Women | Global | ||||
| Worldline | 2018 to Current | Anne Jermy | Global | ||||
| Oxford | Great Western Railway | Great Western Railway | Racal | 1998 to 2009 | Boofay | 1-3, 4 | |
| Amey | 2009 to 2011 | Celia Drummond | 4 | ||||
| Phil Sayer | 1-3 | ||||||
| Worldline | 2011 to Current | Anne Jermy | 1-3 | ||||
| Rodger | 4 | ||||||
| Oxford Parkway | Chiltern Railways | Chiltern Railways | KeTech | 2015 to 2021 | Celia Drummond | 1 | |
| Phil Sayer | 2 | ||||||
| 2021 to Current | Celia Drummond | 1, 2 | |||||
| Oxshott | |||||||
| Oxted | Southern | Southern | Amey | 2002 to 2018 | Celia Drummond | 2 | |
| Phil Sayer | 1 | ||||||
| Worldline | 2018 to Current | Anne Jermy | 1 | ||||
| Mathew Streeton | 2 |