| Army of the Frontier | |
|---|---|
| Active | October 12, 1862 — June 9, 1863 |
| Country | United States of America |
| Branch | United States Army |
| Engagements | American Civil War |
The Army of the Frontier was a Union army that served in the Trans-Mississippi Theater during the Civil War. It fought in several minor engagements in Arkansas, Indian Territory, and Kansas. In June 1863 the Army was discontinued but many of its regiments were formed into the District of the Frontier.