The military history of Thailand encompasses a thousand years of armed struggle, from wars of independence from the powerful Khmer Empire, through to struggles with her regional rivals of Burma and Vietnam and periods of tense standoff and conflict with the colonial empires of Britain and France. Thailand's military history, dominated by her centrality in the south-eastern Asian region, the significance of her far flung and often hostile terrain, and the changing nature of military technology, has had a decisive impact on the evolution of both Thailand and her neighbours as modern nation states. In the post-war era, Thailand's military relationship with the United States has seen her play an important role in both the Cold War and the recent War on Terror, whilst her military's involvement in domestic politics has brought frequent international attention.

Chao Anouvong, or regnal name Xaiya Setthathirath V, , led the Lao rebellion (1826–28) against Siam as the last monarch of the Kingdom of Vientiane. Anouvong succeeded the throne in 1805 upon the death of his brother, Chao Inthavong, Xaiya Setthathirath IV, who had succeeded their father, Ong Bun or Phrachao Siribounyasan Xaiya Setthathirath III. Anou was known by his father's regnal number until recently discovered records disclosed that his father and brother had the same regnal name.