The 3rd Louisiana Infantry Regiment was a unit of foot soldiers that fought in the Confederate States Army during the American Civil War. The regiment distinguished itself at Wilson's Creek in 1861. The 3rd Louisiana fought at Pea Ridge, First Corinth, Iuka, and Second Corinth in 1862. The unit defended Vicksburg in 1863 where it was captured. The surviving soldiers were exchanged and performed guard duty for the rest of the war.