South Western Trains may refer to:
South West Trains (1996–2017), registered as Stagecoach South Western Trains Limited, former train operator in England from privatisation in 1996 until 2017. South Western Railway (2017–2025), registered as First MTR South Western Trains Limited, former train operator in England from 2017 until 2025. South Western Railway, the government owned train operator in England since 2025.