Battery L, 1st Missouri Light Artillery Regiment was an artillery battery unit from Missouri that served in the Union Army during the American Civil War. The original Battery L was formed 1 September 1861 but was disbanded in January 1862. The long-term service Battery L was created in October 1862 by reassigning Battery A, Schofield's Light Artillery. Battery L fought at the battles of Prairie Grove and Van Buren in December 1862. Thereafter, the battery performed guard duty at different locations in Missouri, with a foray into Arkansas. The unit was mustered out on 20 July 1865.