120th Regiment may refer to:
120th Regiment of Foot (disambiguation), British Army regiments 120th Infantry Regiment (United States) 120th Infantry Regiment "Emilia" 120th Field Artillery Regiment 120th Light Anti-Aircraft Regiment, Royal Artillery 120th Heavy Anti-Aircraft Regiment, Royal Artillery 120th (South Midland) Field Regiment, Royal Artillery 120th Motorized Artillery Regiment, Italy 120th Fighter Aviation Regiment 120th Guards Fighter Aviation Regiment
American Civil War regiments 120th Illinois Infantry Regiment 120th Indiana Infantry Regiment 120th New York Infantry Regiment 120th Ohio Infantry Regiment
See also 120th Brigade (disambiguation) 120th Division (disambiguation)