| Japanese Fortieth Army | |
|---|---|
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| Active | January 12, 1945 - August 15, 1945 |
| Country | Empire of Japan |
| Branch | Imperial Japanese Army |
| Type | Infantry |
| Role | Corps |
| Garrison/HQ | Ijuin, Kagoshima |
| Nickname(s) | Yō (陽, positive) |
| Engagements | Operation Downfall |
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The Japanese 40th Army (第40軍, Dai-yonjyū gun) was an army of the Imperial Japanese Army during the final stages of World War II.