46th Regiment

46th Regiment or 46th Infantry Regiment may refer to:

United Kingdom

 * 46th (South Devonshire) Regiment of Foot, a unit of the British Army
 * 46th (Liverpool Welsh) Royal Tank Regiment, a unit of the British Army
 * 46th Infantry Brigade (United Kingdom), a unit of the British Army

United States

 * 46th Infantry Regiment (United States), a unit of the United States Army

Union (Northern) Army regiments

 * 46th Illinois Volunteer Infantry Regiment
 * 46th Iowa Volunteer Infantry Regiment
 * 46th Wisconsin Volunteer Infantry Regiment
 * 46th Indiana Infantry Regiment
 * 46th New York Volunteer Infantry
 * 46th Ohio Infantry
 * 46th United States Colored Infantry

Confederate (Southern) Army regiments

 * 46th North Carolina Infantry Regiment
 * 46th Virginia Infantry Regiment (Pendleton County, West Virginia), a Virginia State Unit
 * 46th Arkansas Infantry (Mounted)
 * 46th Virginia Infantry