The 13th Arkansas Infantry (1861–1865) was a Confederate Army infantry regiment during the American Civil War. Organized mainly from companies, including several prewar volunteer militia companies, raised in northeastern Arkansas, the regiment was among the first transferred to Confederate Service, and spent virtually the entire war serving in Confederate forces east of the Mississippi River. After the unit sustained heavy casualties during the Battle Murfreesboro, the unit spent most of the rest of the war field consolidated with the 13th Arkansas Infantry Regiment, to form the 5th/13th Arkansas Infantry Regiment.