The 3rd Missouri Light Battery (also known as MacDonald's Missouri Battery and Dawson's Missouri Battery) was an artillery battery of the Confederate States Army during the American Civil War. The battery originated as a Missouri State Guard unit active in late 1861, and was officially transferred to the Confederate States Army on January 28, 1862. The battery provided artillery support at the Battle of Pea Ridge in March 1862, and was lightly engaged at the Battle of Iuka in September. In October 1862, the battery was lightly engaged at the Second Battle of Corinth and saw action at the Battle of Davis Bridge, where it lost at least one cannon. The 3rd Light Battery saw action at the Battle of Champion Hill on May 16, 1863, and had its cannons captured at the Battle of Big Black River Bridge the next day. After participating in the Siege of Vicksburg, the battery was captured on July 4, 1863 and was paroled and exchanged. The battery was then consolidated with the Jackson Missouri Battery; the 3rd Light Battery designation was continued. In early 1864, the battery received replacement cannons and was assigned to the defense of Mobile Bay. The 3rd Light Battery saw action at the Battle of Spanish Fort in March and April 1865. When the Confederate Department of Alabama, Mississippi, and East Louisiana surrendered on May 4, 1865, the battery was again captured; the men of the battery were paroled on May 10, ending their military service.