The Helena Artillery (1861–1865) was a Confederate Army artillery battery during the American Civil War. The unit was known by several other designations during the war including Clarkson's Battery, Company A, Shoup's Artillery Battalion, Calvert's Battery, and Key's Battery. The unit was occasionally assigned to artillery battalions from other states, so the Arkansas unit was at various times designated as Company C, 20th Alabama Light Artillery Battalion and later as Company H, 28th Georgia Artillery Battalion.
