Glen Strathallan was a British ship originally built as a trawler, but then converted into a private yacht, which also served in the Royal Navy in World War II.

The ship was built in 1928 by Cochrane & Sons of Selby, Yorkshire, as a steam fishing trawler and registered at Glasgow as F/V Glen Strathallan (GW.15).

Unfortunately, the company that ordered her went bankrupt before she was completed, so she was bought by Robert Alfred Colby Cubbin,[3] who spent £30,000[4] converting her into a yacht under the same name, registered at Douglas, Isle of Man.

[3] On the outbreak of World War II in September 1939, Glen Strathallan was requisitioned by the Royal Navy.

Intended to be used as a diver training site, she was sunk in shallow water, but soon found to be obstructing the entrance to the port and was dispersed using explosives.