| Unit Name: | 135th Illinois Infantry Regiment |
| Dates: | June 6–September 28, 1864 |
| Country: |  United States |
| Allegiance: | Union |
| Branch: | Infantry |
| Size: | Regiment |
| Battles: | American Civil War |
| Disbanded: | September 28, 1864 |
| Commander1: | John S. Wolfe[1] |
| Commander1 Label: | Colonel |
The 135th Illinois Infantry Regiment was an infantry regiment from Illinois that served in the Union Army between June 6 and September 28, 1864, during the American Civil War.
The regiment was organized at Mattoon, Illinois, with a strength of 852 men,[2] and mustered in for one-hundred-day service on June 6, 1864.[3] [4] On June 10, the regiment departed for Benton Barracks, Missouri, where they reported to General William Rosecrans.[5] [6]
From there five companies of the regiment were stationed on the Iron Mountain railroad.[7] [8] Three companies of the regiment were stationed at the Gasconade railroad crossing and a further two companies stationed at the Osage railroad crossing of the Missouri Pacific Railroad and at Jefferson City, Missouri.[9] [10] The regiment was mustered out on September 28, 1864.[11] [12] During its service the regiment lost one man at Gasconade crossing and sixteen men to disease.[13] [14]