Battery M, 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 M fought at Meridian, Fort DeRussy, Pleasant Hill, Yellow Bayou, and Tupelo in 1864.

After serving on garrison duty in west Tennessee, the battery mustered out on 25 July 1865.

Artillery, 5th Division, Army of Mississippi, to April, 1862.

Artillery, 1st Division, Army Mississippi, to September, 1862.

Artillery, 3rd Division, Army Mississippi, to November, 1862, Artillery, 7th Division, Left Wing 13th Army Corps (Old), Dept.

Artillery, 1st Division, 17th Army Corps, to March, 1864.

Artillery, Provisional Division, 17th Army Corps, Dept.

Artillery Reserve, District of West Tennessee, to July, 1865.

Moved to Jefferson City February 7–10, thence to Commerce, Mo.

Chewalla and Big Hill near Ruckersville and Ripley October 7.

Grant's Central Mississippi Campaign November 2, 1862 – January 10, 1863.

Yazoo Pass Expedition and operations against Fort Pemberton and Greenwood March 13-April 5.

Movement on Bruinsburg and turning Grand Gulf April 25–30.

Duty at Memphis and in District of West Tennessee until July, 1865.