Chiap Saeng-Xuto (Thai: เฉียบ แสง-ชูโต, 16 September 1902 – 28 November 1971), known by the noble title Luang Pradiyat Navayudh (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.
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