Battle of Mill Springs order of battle: Union

The following Union Army units and commanders fought in the Battle of Mill Springs during the American Civil War on January 19, 1862, near present-day Nancy, Kentucky. The Confederate order of battle is listed separately.

Military rank

 * BG = Brigadier General
 * Col = Colonel
 * Ltc = Lieutenant Colonel
 * Maj = Major
 * Cpt = Captain

Other

 * w = wounded

First Division, Army of the Ohio
BG George Henry Thomas

Nearby troops not engaged

 * 10th Kentucky Infantry: Col John Marshall Harlan
 * 2nd Minnesota Infantry, Company A: Cpt Judson Bishop (on picket duty; engaged in pursuit to Beech Grove)
 * 17th Ohio Infantry: Col John M. Connell
 * 35th Ohio Infantry: Col Ferdinand Van Derveer
 * 38th Ohio Infantry, Company A: Cpt Charles Greenwood (camp guard; engaged in pursuit to Beech Grove)
 * 1st Michigan Engineers & Mechanics, Companies D, F, G: Ltc K. A. Hunton (camp guard)