TSS Great Western was a passenger vessel built for the Great Western Railway in 1902.
She was built by Laird Brothers in Birkenhead for the Great Western Railway as a twin-screw steamer for the Irish Sea ferry service between Milford Haven and Waterford. She was a sister ship to TSS Great Southern.
Later in her career she operated occasionally from Weymouth.
In 1931 it was reported that she achieved a record crossing from Fishguard to Waterford, maintaining an average speed of 19.9 knots.
In 1933 she was succeeded by a new ship of the same name, TSS Great Western and was renamed G.W.R. No. 20 until sold for scrapping by John Cashmore of Newport, Monmouthshire.