Battery "D", 1st Illinois Light Artillery Regiment was an artillery battery from the state of Illinois that served in the Union Army during the American Civil War. The battery was authorized in July 1861 at Cairo, Illinois. The unit fought at Fort Donelson and Shiloh in 1862, Port Gibson, Raymond, Jackson, Champion Hill, and Vicksburg in 1863, and Meridian, Atlanta, and Nashville in 1864. The battery was mustered out of Federal service in July 1865.