140th Regiment may refer to:
140th Aviation Regiment, United States 140th (5th London) Field Regiment, Royal Artillery 140th Infantry Regiment (United States) 140th Separate Special Purpose Regiment, Ukraine
American Civil War regiments 140th Illinois Infantry Regiment 140th Indiana Infantry Regiment 140th New York Infantry Regiment 140th Ohio Infantry Regiment 140th Pennsylvania Infantry Regiment
See also 140th Brigade (disambiguation) 140th Division (disambiguation) 140th (disambiguation)