St Denys railway station serves the St. Denys and Portswood suburbs of Southampton in Hampshire, England.
Built in 1865, the station is named after the surrounding area, which in turn is named after the Priory of St Denys, a major landmark in medieval Southampton.
Services run hourly to Portsmouth & Southsea and Southampton. These are operated by South West Trains using Class 450s. Also, there are hourly services between Salisbury and Romsey via Southampton &, using Class 158s.
The station is at the site of the junction between the London to Weymouth mainline and the West Coastway Line running between Southampton and Portsmouth. It is currently served mainly by South West Trains, with irregular services operated by Southern. There are four platforms; two on the main line and two on the branch line.