| Luang Pradiyat Navayudh | |
| Birth Name: | Chiap Saeng-Xuto |
| Birth Date: | 16 September 1902 |
| Nationality: | Thai |
| Occupation: | Naval officer, Olympic sailor |
Chiap Saeng-Xuto (Thai: เฉียบ แสง-ชูโต, 16 September 1902 – 28 November 1971), known by the noble title Luang Pradiyat Navayudh (Thai: หลวงประดิยัตนาวายุทธ์), was a Thai naval captain. He was the eldest son of Admiral Phraya Mahayotha (Chang Saeng-Xuto) and a nephew of Chaophraya Surasakmontri (Choem Saeng-Xuto). He attended the Royal Naval College, Greenwich and joined the Royal Thai Navy in 1927, serving until 1946 when he was transferred to a civilian post under the Ministry of Foreign Affairs.[1] He was also a sports sailor, and competed in the Star event at the 1956 Summer Olympics.[2]