43rd Illinois Infantry Regiment
| 43rd Regiment Illinois Volunteer Infantry | |
|---|---|
Illinois state flag  | |
| Active | October 12, 1861, to November 30, 1865 | 
| Country | United States | 
| Allegiance | Union | 
| Branch | Infantry | 
| Engagements | Battle of Shiloh Siege of Vicksburg  | 
The 43rd Regiment Illinois Volunteer Infantry, known as the "Koerner Regiment" after Gustav Körner, was an infantry regiment that served in the Union Army during the American Civil War.