The Burmese–Siamese War (1765–1767) is the second military conflict between the Konbaung Dynasty of Burma (Myanmar) and the Ban Phlu Luang Dynasty of Siam (Thailand), and the war that ends the four-century-old Siamese kingdom.

Nonetheless, the Burmese are soon forced to give up their hard-won gains when the Chinese invasions of their homeland force a complete withdrawal by the end of 1767.

A new Siamese dynasty, to which the current Thai monarchy traces its origins, emerges to reunify Siam by 1770.