The Royal Thai Navy is the naval warfare force of Thailand. Established in 1906, it was modernised by the Admiral Prince Abhakara Kiartiwongse (1880–1923) who is known as the father of the Royal Navy. It has a structure that includes the naval fleet, Royal Thai Marine Corps, and Air and Coastal Defence Command. The RTN headquarters is at Sattahip Naval Base.

Admiral Prince Abhakara Kiartivongse, Prince of Chumphon, was the 28th child of King Chulalongkorn. He was commonly revered as "The Father of the Thai Navy".