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
American Civil War regiments 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
See also 46th Division (disambiguation) 46th Brigade (disambiguation) 46th Squadron (disambiguation)