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The Royal Chronicle of the Old Kingdom: Luang Prasoet Version (Thai: พระราชพงศาวดารกรุงเก่า ฉบับหลวงประเสริฐ), commonly known as the Luang Prasoet Chronicle, is a manuscript of the Royal Chronicles of Ayutthaya—a historical account of the Kingdom of Ayutthaya, a former kingdom in present-day Thailand. It was discovered and brought to the Vajirañāṇa Royal Library by a Thai nobleman, Luang Prasoet-aksonnit (Phae Talalak), in 1907, and was thus named after him in his honour.

According to its preface, the document was compiled in 1681. It presents the chronicle in an abridged version, and its dating is considered by historians to be mostly accurate, unlike other versions which may have been subject to later copying errors.^[1]