11th Regiment or Eleventh Regiment may refer to:
Australia 2/11th Armoured Car Regiment (Australia) 11th Engineer Regiment (Australia) 11th (North Auckland) Mounted Rifles
Canada Irish Fusiliers of Canada
Confederate States 11th Alabama Infantry Regiment 11th Arkansas Infantry Regiment 11th (Ashcraft's) Mississippi Cavalry Regiment 11th (Perrin's) Mississippi Cavalry Regiment 11th Mississippi Infantry Regiment 11th Missouri Infantry Regiment (Confederate) 11th Texas Cavalry Regiment 11th Texas Infantry Regiment 11th Virginia Cavalry Regiment 11th Virginia Infantry Regiment
France 1st-11th Cuirassier Regiment 11e régiment parachutiste de choc 11th Marine Artillery Regiment
German Empire 2nd Westphalian Hussar Regiment, No. 11
Greece 11th Infantry Regiment (Greece)
India 11th Armoured Regiment (India)
Italy 11th Alpini Regiment 11th Engineer Regiment (Italy) 11th Field Artillery Regiment (Italy) 11th Heavy Field Artillery Regiment (Italy) 11th Infantry Regiment "Casale" 11th Signal Regiment (Italy)
Malaysia 11th Special Service Regiment
New Zealand 11th Coast Regiment, Royal New Zealand Artillery
Pakistan 11th Cavalry (Frontier Force)
Philippines 11th Field Artillery Regiment (PA)
Thailand 11th Infantry Regiment (Thailand)
United Kingdom 11 Explosive Ordnance Disposal and Search Regiment RLC 11th Hussars Devonshire Regiment
United States 11th Armored Cavalry Regiment 11th Coast Artillery (United States) 11th Field Artillery Regiment 11th Illinois Cavalry Regiment 11th Illinois Infantry Regiment 11th Indiana Infantry Regiment 11th Infantry Regiment (United States) 11th Iowa Infantry Regiment 11th Kentucky Infantry Regiment 11th Maine Infantry Regiment 11th Marine Regiment 11th Massachusetts Infantry Regiment 11th Massachusetts Regiment 11th Michigan Cavalry Regiment 11th Michigan Infantry Regiment 11th Michigan Infantry Regiment (reorganized) 11th Minnesota Infantry Regiment 11th New Hampshire Infantry Regiment 11th New York Infantry Regiment 11th Ohio Infantry Regiment 11th Pennsylvania Infantry Regiment 11th Pennsylvania Regiment 11th Regiment of Connecticut Militia 11th Tennessee Cavalry Regiment 11th Vermont Infantry Regiment 11th Virginia Regiment 11th West Virginia Infantry Regiment 11th Wisconsin Infantry Regiment
See also 11th Army (disambiguation) 11th Brigade (disambiguation) 11th Division (disambiguation) 11 Squadron (disambiguation)