Island Line is a brand of the South Western Railway train operating company which runs the 8.5-mile (13.7 km) Island Line on the Isle of Wight. A stand-alone franchise from 1996 until 2007, it then became part of the South Western franchise operated by South West Trains until August 2017 and since by South Western Railway.

The Island Line is a railway line on the Isle of Wight which runs along the island's east coast and links Ryde Pier Head with Shanklin. Trains connect at Ryde Pier Head with passenger ferries to Portsmouth Harbour, and these ferries in turn connect with the rest of the National Rail network via the Portsmouth Direct Line. The line also connects to the Isle of Wight Steam Railway, a heritage railway, at Smallbrook Junction. For much of its length the line runs alongside the A3055, criss-crossing this road by means of the Ryde Tunnel and bridges at Rowborough, Morton Common, Lake Hill and Littlestairs.