| Illinois Reserve Militia | |
|---|---|
| Active | 25 June 1917 - 1919 1941 - 1946 |
| Country |  United States |
| Allegiance |  Illinois |
| Branch | Army |
| Type |  State defense force |
| Role | Military reserve force |
| Commanders | |
| Current commander | Governor of Illinois |
The Illinois Reserve Militia was the state defense force of Illinois during World War I and World War II. After the Illinois National Guard was federalized, the Illinois Reserve Militia was organized to assume the stateside duties of the National Guard.