146th Regiment may refer to:
146th Field Artillery Regiment, United States 146th (Pembroke and Cardiganshire) Field Regiment, Royal Artillery 146th Light Anti-Aircraft Regiment, Royal Artillery 146th Heavy Anti-Aircraft Regiment, Royal Artillery 146th Infantry Regiment (United States) 146th Regiment Royal Armoured Corps
American Civil War regiments 146th Illinois Infantry Regiment 146th Indiana Infantry Regiment 146th New York Infantry Regiment 146th Ohio Infantry Regiment
See also 146th Division (disambiguation)