The fourth HMS Tobago (K585), ex-Hong Kong, was a Colony-class frigate of the United Kingdom which served in the Royal Navy during World War II.

She was reclassified as a "patrol frigate," PF-81, on 15 April 1943 and laid down by the Walsh-Kaiser Company at Providence, Rhode Island, on 17 August 1943.

[1] Intended for transfer to the United Kingdom, the ship was first renamed Hong Kong and then Tobago by the British prior to launching and was launched on 27 September 1943, sponsored by Mrs. D. W. Ambridge of Ottawa, Ontario, Canada.

Transferred to the United Kingdom under Lend-Lease on 12 August 1944, the ship served in the Royal Navy as HMS Tobago (K585) on patrol and escort duty until 1945.

She subsequently was sold to the Boston Metals Company of Baltimore, Maryland, for scrapping, but her scrapping was cancelled and in 1950 she was resold to Khedivial Mail Lines of Alexandria, Egypt, for use as a civilian passenger vessel.