The 3rd Missouri Cavalry Regiment was a cavalry regiment that served in the Union Army during the American Civil War principally in Missouri and Arkansas.

The regiment lost 3 Officers and 37 Enlisted men killed or mortally wounded, 1 Officer and 172 Enlisted men killed by disease.

[1] The Commander of the Regiment was Colonel John M. Glover from August 5, 1861, through March 13, 1864.

This company was formed from Missouri men from Marion and Knox Counties.

Company D was composed of equal numbers of Missouri and Illinois men.