131st Regiment may refer to:
131st Airborne Engineer Regiment 131st Artillery Regiment "Centauro", Italy 131st Aviation Regiment, United States 131st Cavalry Regiment, United States 131st Engineer Battalion "Ticino", Italy 131st (Lowland – City of Glasgow) Field Regiment, Royal Artillery 131st Light Anti-Aircraft Regiment, Royal Artillery 131st Heavy Anti-Aircraft Regiment, Royal Artillery 131st Infantry Regiment (United States) 131st Regiment (XPCC) 131st Regiment of Foot 131st Tank Regiment, Italy
American Civil War regiments 131st Illinois Infantry Regiment 131st New York Infantry Regiment 131st Ohio Infantry Regiment 131st Pennsylvania Infantry Regiment
See also 131st Division (disambiguation)