HTMS Krabi (OPV-551) is an offshore patrol vessel (OPV) of the Royal Thai Navy.

She is a modified River-class patrol vessel, and was built by Mahidol Adulyadej Naval Dockyard, with design and technology transfer support from BAE Systems Surface Ships.

[4][5] The Thai Navy plans to use Krabi to patrol Thailand's Economic Exclusion Zone (EEZ), as well as for fishery and natural resource protection and disaster relief.

[3] Her top speed is expected to be over 25 knots (46 km/h; 29 mph),[4] and she is powered by two MAN 16v 28/33D diesel engines, making about 7.2 megawatts (9,700 hp).

In May 2016 the Royal Thai Navy said it is planning to deploy its new H145M helicopters from HTMS Krabi in service with 202 Squadron.