PS Glen Rosa was a 306 GRT passenger paddle steamer that J&G Thomson launched in 1893 for the Glasgow and South Western Railway (G&SWR).

She was absorbed into the London, Midland and Scottish Railway fleet in 1923, transferred to the Caledonian Steam Packet Company in 1938 and scrapped in 1939.

[2] At the same time Thomson built an exact sister ship, PS Slieve Donard, for the Belfast and County Down Railway.

[3] In the First World War the Admiralty requisitioned Glen Rosa, renamed her HMS Glencross and had her converted into a minesweeper.

[3] Later she worked on the route between Wemyss Bay on the North Ayrshire coast, Millport on Great Cumbrae and Kilchattan on the Isle of Bute.