The Gloucester to Newport Line is a railway cutoff along the bank of the River Severn in the United Kingdom from Gloucester to Newport. It is an important link between the West Midlands and South Wales, and was formerly the main route from London before the construction of the Severn Tunnel.

Gloucester-Newport Line - Principal stations (from east to west)

• Gloucester
• for Cross Country Route
• for Golden Valley Line
• Lydney
• Chepstow
• Caldicot
• Severn Tunnel Junction
• for South Wales Main Line
• Newport
• for South Wales Main Line
• for Welsh Marches Line

Local passenger services are currently provided by Arriva Trains Wales, with an approximately hourly service in each direction. These are supplemented by Central Trains services between Cardiff and Nottingham, which are part of their "Citylink" network. The Central Trains services serve Gloucester and Newport, but do not serve any of the intermediate stations except during the early morning and late evening.

Though Caldicot and Severn Tunnel Junction stations are 3/4 mile apart, Caldicot's centrality kept it open in 1964 when other small stations were closed under Beeching's axe. Severn Tunnel Junction serves the village of Rogiet and is where this line merges with the main line through the tunnel, so it is also a stop on the Cardiff-Bristol service.