This is a list of regiments from Missouri that fought in the Union Army during the American Civil War (1861–1865). The list of Missouri Confederate Civil War units is shown separately.
Missouri State Militia Cavalry
- 1st Missouri State Militia Cavalry
- 1st Battalion Missouri State Militia Cavalry "Krekel's"
- 2nd Missouri State Militia Cavalry
- 2nd Battalion Missouri State Militia Cavalry
- 3rd Missouri State Militia Cavalry (Old)
- 3rd Missouri State Militia Cavalry (New)
- 5th Missouri State Militia Cavalry
- 5th Missouri State Militia Cavalry (Old)
- 5th Missouri State Militia Cavalry (New)
- 6th Missouri State Militia Cavalry
- 7th Missouri State Militia Cavalry
- 8th Missouri State Militia Cavalry
- 9th Missouri State Militia Cavalry
- 10th Missouri State Militia Cavalry
- 11th Missouri State Militia Cavalry
- 12th Missouri State Militia Cavalry
- 13th Missouri State Militia Cavalry
- 14th Missouri State Militia Cavalry