HTMS Angthong (LPD-791) (Thai: เรือหลวงอ่างทอง) is a Royal Thai Navy amphibious ship based on the design of Endurance-class landing platform dock of the Republic of Singapore Navy.

Angthong was commissioned as part of the Thai navy's procurement of landing platform docks to expand its humanitarian assistance and disaster relief capacity following the 2004 Indian Ocean tsunami.

[2][3] On 11 November 2008, a SGD 200 million contract was signed between ST Marine and Thailand for the sale of one unit of the Endurance-class LPD and its associated landing craft.

[6] On 21 March 2011, the new ship was christened HTMS Angthong (pennant number LPD-791) and was launched from ST Marine's dockyard by the wife of Admiral Khamthorn Pumhiran, Commander-In-Chief of Royal Thai Navy (RTN).

[7][8] The Angthong was deployed as a base of operations for the navy's humanitarian assistance mission during the 2015 Rohingya refugee crisis,[9] and to provide disaster relief during flooding in Southern Thailand in January 2017.