Battery M, 2nd Illinois Light Artillery Regiment was an artillery battery from Illinois that served in the Union Army during the American Civil War.

The unit was assigned to guard the railroad in West Virginia and was captured and paroled when Harpers Ferry surrendered in September 1862.

After exchange, the battery took part in the Knoxville campaign in the fall and winter of 1863.

Paroled September 16 and moved to Annapolis, Md., thence to Camp Douglass, Chicago, Ill., and duty there until May, 1863.

Expedition up Big Sandy Valley to Beaver Creek June 14-July 22.

District of North Central Kentucky, 1st Division, 23rd Army Corps, to January, 1864.

District of Southwest Kentucky, 1st Division, 23rd Army Corps, to April, 1864.

Burnside's Expedition over Cumberland Mountains into East Tennessee August 17-October 17, 1863.