Battery M, 1st Illinois Light Artillery Regiment was an artillery battery from Illinois that served in the Union Army during the American Civil War.

The battery was organized in August 1862 at Chicago and was on duty in Kentucky until January 1863.

Thereafter, the unit garrisoned Chattanooga, Tennessee until it was mustered out in July 1865.

Organized at Camp Douglass, Chicago, Ill., and mustered on August 12, 1862.

34th Brigade, 10th Division, Army Ohio, to November, 1862.

34th Brigade, 10th Division, District of West Kentucky, Dept.

Reed's Brigade, Baird's Division, Army of Kentucky, Dept.

1st Division, Reserve Corps, Army of the Cumberland, to October, 1863.

Artillery Brigade, 4th Army Corps, to October, 1864.

Operations on line of Pumpkin Vine Creek and Battles about Dallas, New Hope Church and Allatoona Hills May 25-June 5.

Garrison duty at Chattanooga, Cleveland and Charleston, Tenn., until July, 1865.

Battery lost 4 Enlisted men killed and mortally wounded and 1 Officer and 10 Enlisted men by disease, Total 15.