| 20th Indiana Volunteer Infantry Regiment | |
|---|---|
 Surviving members of the 20th Indiana Regt. gather at the Gettysburg Battleground for the dedication of a monument in their honor, 1885. | |
| Active | July 22, 1861, to July 12, 1865 |
| Country | United States |
| Allegiance | Union |
| Branch | Infantry |
| Type | Rifle regiment |
| Size | Regiment |
| Engagements | Battle of Hampton Roads Peninsular Campaign Battle of Second Bull Run Battle of Chantilly Battle of Chancellorsville Battle of Fredericksburg Battle of Gettysburg Battle of the Wilderness Battle of Spotsylvania Battle of Cold Harbor Siege of Petersburg |
The 20th Indiana Volunteer Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War. The Regiment was officially raised on July 22, 1861, by William L. Brown, the first Colonel of the Regiment, in response to President Lincoln's call for volunteers. At the time of muster, the regiment had 9 fighting companies lettered A-K along with a staff company for a total of 10 companies, roughly 1000 men. The 20th Indiana saw engagements in most of the major battles of the American Civil War, including the action between the first ironclads at Hampton Roads, the Battle of Fredericksburg, the Battle of Gettysburg, and the Siege of Petersburg. The Regiment was part of the 1st Brigade, 3rd Division, III Corps for the duration of the war.