| 2nd Battalion, 1st Air Defense Artillery | |
|---|---|
&sq=&lang=&file=File:1-1_ADA_copy.svg) Distinctive Unit Insignia | |
| Active | 1812 |
| Country |  United States |
| Branch | Army |
| Type | Air Defense Artillery |
| Size | Battalion |
| Part of | 35th Air Defense Artillery Brigade |
| Garrison/HQ | Camp Carroll, South Korea |
| Motto(s) | Stand or Die! |
| Mascot(s) | The Guardian |
| Equipment | Patriot Missile System |
The 2nd Battalion, 1st Air Defense Artillery Regiment (2-1st ADAR) is a battalion in the 1st Air Defense Artillery Regiment, a regiment in the United States Army, first formed in 1812, and based in South Korea.