The 20th Arkansas Infantry (1861–1865) was a Confederate Army infantry regiment during the American Civil War. The unit was also known as the 22nd Arkansas Infantry. When the unit was reorganized following its capture at the Siege of Vicksburg, it was officially redesignated as the 41st Arkansas Infantry (Mounted), by the Arkansas State Military Board, but this redesignation was completely ignored by the unit and Confederate authorities. The unit participated in the Camden Expedition and Price's Missouri Expedition as a mounted infantry unit.