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

The unit performed occupation duties until November 1862 when it participated in Ulysses S. Grant's Central Mississippi campaign.

The battery served during the Siege of Vicksburg and Jackson Expedition in 1863.

For the remainder of the war, the unit was assigned more occupation duties before being mustered out in July 1865.

Artillery, 4th Division, Right Wing 13th Army Corps, to December, 1862.

Artillery, Cavalry Division, District of West Tennessee, to February, 1865.

Unattached Artillery, District of West Tennessee, to July, 1865.

Grierson's raid on Mobile & Ohio R. R. December 21, 1864 – January 15, 1865.

Battery lost during service 1 Officer and 10 Enlisted men by disease.