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 battery was organized in December 1861 at Springfield, Illinois. 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.