TrSS St David was a passenger vessel built for the Great Western Railway in 1906.
She was built by John Brown and Company for the Great Western Railway as one of a trio of new ships which included and .
From 1914 to 1919 she was requisitioned by the British Government as a hospital ship for the duration of the First World War.
She was re-engined in 1925.
On 20 August 1927 she was in collision with her sister ship TrSS St Patrick in Fishguard harbour.
In 1932 she was renamed Rosslare, to allow for a successor vessel to be named St Patrick. She was scrapped in September 1933.