| Station name | Postcode External links to map of station at Multimap.com | Code External links to livedepartureboards.com showing current departures and arrivals for this station | |
|---|---|---|---|
| Oakengates | TF2 6DT | OKN | |
| Oakham | LE15 6RE | OKM | |
| Oakleigh Park | EN4 8DR | OKL | |
| Oban | PA34 4NU | OBN | |
| Ockendon | RM15 6PD | OCK | |
| Ockley | RH5 5HT | OLY | |
| Okehampton | EX20 1EJ | OKE | |
| Old Hill | B64 6PL | OHL | |
| Old Roan | L10 3JG | ORN | |
| Old Street | EC1V 9NR | OLD | |
| Oldfield Park | BA2 3RN | OLF | |
| Olton | B92 8BS | OLT | |
| Ore | TN34 3SN | ORE | |
| Ormskirk | L39 2YN | OMS | |
| Orpington | BR6 0SX | ORP | |
| Orrell | WN5 8TH | ORR | |
| Orrell Park | L9 8BU | OPK | |
| Otford | TN14 5QY | OTF | |
| Oulton Broad North | NR32 3LJ | OUN | |
| Oulton Broad South | NR33 8QX | OUS | |
| Outwood | WF3 3HR | OUT | |
| Overpool | CH66 3NP | OVE | |
| Overton | RG25 3JJ | OVR | |
| Oxenholme Lake District | LA9 7HF | OXN | |
| Oxford | OX1 1HS | OXF | |
| OX2 8HA | OXP | ||
| Oxshott | KT22 0TA | OXS | |
| Oxted | RH8 0QD | OXT |