The Eighteenth Area Army (第18方面軍, Dai jyūhachi hōmen gun) was a field army of the Imperial Japanese Army during World War II.

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Eighteenth Area Army
Japanese troops in Burma
Active	January 4, 1943 - August 15, 1945
Country	Empire of Japan
Branch	Imperial Japanese Army
Type	Infantry
Role	Field Army
Garrison/HQ	Bangkok
Nickname(s)	義 (Gi = “righteous”)

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The 18th Area Army was originally formed on January 4, 1943, as the Thailand Garrison Command (泰国駐屯軍司令官, Tai-koku Chūtongun shirebu). It was renamed the Thirty-ninth Army on December 14, 1944, and became the 18th Area Army on July 7, 1945, shortly before the end of the Pacific War.^[1]

The 18th Area Army was under the control of the Southern Expeditionary Army Group as a military reserve and garrison force, ostensibly to help defend the Empire of Japan's nominal ally, the Kingdom of Thailand against possible invasion by the Allies, but in more practical terms, it was present to ensure that Thailand remained an ally to Japan. It was headquartered in Bangkok.^{[citation needed]}

The 18th Area Army was demobilized in Bangkok at the surrender of Japan on August 15, 1945, without having seen combat.^{[citation needed]}