Battery K, 1st Missouri Light Artillery Regiment was an artillery battery unit from Missouri that served in the Union Army during the American Civil War. The 1st Missouri Light Artillery Regiment was formed 1 September 1861. Battery K fought at Fort Henry, Fort Donelson, Shiloh, 1st Corinth, and 2nd Corinth in 1862. The unit was in action at Helena and Bayou Fourche in 1863. Battery K performed garrison and occupation duty at Little Rock, Arkansas in 1863–1865 before being mustered out on 4 August 1865.