| Southeast Asia Treaty Organisation | |
|---|---|
| 1954–1977 | |
 Flag | |
| Headquarters | Bangkok |
| History | |
• Established | 8 September 1954 |
• Dissolution | 30 June 1977 |
The Southeast Asia Treaty Organisation (SEATO) was an imperialist military organisation between the US, UK, France, Australia, New Zealand, Pakistan, Philippines, and Thailand. The purpose of the organisation was to prevent the spread of communism in Southeast Asia.