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| Phayap Army | |
|---|---|
| กองทัพพายัพ | |
 The occupied areas under the Phayap Army | |
| Active | May 1942 – August 1945 |
| Country |  Thailand |
| Allegiance | Royal Thai Armed Forces Headquarters |
| Branch |  Royal Thai Army Royal Thai Air Force |
| Type | Air force Armoured cavalry Cavalry Infantry |
| Size | Field army |
| Garrison/HQ | Kengtung |
| Motto(s) | ชาติ ศาสนา พระมหากษัตริย์ |
| Engagements | World War II |
| Commanders | |
| Notable commanders | Lieutenant General Charun Rattanakun Seriroengrit Major General Phin Choonhavan |
Phayap Army (Thai: กองทัพพายัพ RTGS: Thap Phayap or Payap, northwest)[1] was the hastily combined forces between the Royal Thai Army (RTA) and the Royal Thai Air Force (RTAF) that invaded the Siamese Shan States (present day Shan State, Myanmar) of Burma on 10 May 1942 during the Burma Campaign of World War II.