The 3rd Missouri Infantry Regiment may refer to: * 3rd Missouri Infantry Regiment (Confederate), Confederate regiment during the American Civil War * 3rd Missouri Infantry Regiment (3 months, 1861), Union regiment during the American Civil War * 3rd Missouri Infantry Regiment (Union), Union regiment during the American Civil War This disambiguation page lists articles about military units and formations which are associated with the same title. If an internal link referred you to this page, you may wish to change the link to point directly to the intended article.