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4th Battle Squadron (United Kingdom)4th Bengal European Cavalry4th Bengal European Regiment
4th Blackshirt Division (3 January)4th Bombardment Squadron4th Bombay Grenadiers
4th Bombay Native Infantry4th Brigade4th Brigade, 104th Division (United States)
4th Brigade (Australia)4th Brigade Combat Team4th Brigade Combat Team, 10th Mountain Division
4th Brigade Combat Team, 1st Armored Division4th Brigade Combat Team, 1st Armored Division (United States)4th Brigade Combat Team, 1st Infantry Division
4th Brigade Combat Team, 2nd Infantry Division4th Brigade Combat Team, 4th Infantry Division (United States)4th Brigade Combat Team, 82nd Airborne Division
4th Brigade Combat Team (Airborne), 25th Infantry Division4th Brigade Royal Field Artillery4th California Infantry
4th California Infantry Regiment4th Canadian Armoured Brigade4th Canadian Division
4th Canadian Division Support Group4th Canadian Engineers4th Canadian Infantry Brigade
4th Carabinier Regiment4th Carabinier Regiment (France)4th Carabinieri Battalion "Veneto"
4th Carnatic Battalion4th Cavalry4th Cavalry (India)
4th Cavalry (Indian Army)4th Cavalry Brigade4th Cavalry Brigade (Australia)
4th Cavalry Brigade (Imperial Japanese Army)4th Cavalry Brigade (Poland)4th Cavalry Brigade (United Kingdom)
4th Cavalry Brigade (United States)4th Cavalry Corps (Russian Empire)4th Cavalry Corps (Soviet Union)
4th Cavalry Division (British Indian Army)4th Cavalry Division (German Empire)4th Cavalry Division (India)
4th Cavalry Division (Russian Empire)4th Cavalry Regiment (United States)4th Centre for Combat Employment and Retraining of Personnel
4th Civil Affairs Group4th Combat Cargo Group4th Combat Engineer Battalion
4th Combat Engineer Regiment (Australia)4th Commando Battalion (Belgium)4th Composite Group
4th Connecticut Infantry Regiment4th Connecticut Regiment4th Continental Artillery Regiment
4th Continental Light Dragoons4th Corps (Turkey)4th Corps (Vietnam People's Army)
4th Corps of the Army of the Republic of Bosnia and Herzegovina4th Cruiser Squadron4th Delaware Infantry Regiment
4th Delaware Volunteer Infantry4th Destroyer Flotilla4th Destroyer Squadron (United Kingdom)
4th Division4th Division (Australia)4th Division (German Empire)
4th Division (Imperial Japanese Army)4th Division (Iraq)4th Division (Japan)
4th Division (New Zealand)4th Division (North Korea)4th Division (Reichswehr)
4th Dragoon Regiment (France)4th Duke of Cambridge's Own Hodson's Horse4th East Anglian Brigade, Royal Field Artillery
4th Eastern Siberian Corps4th Engineer Battalion4th Engineer Battalion (Belgium)
4th Engineer Battalion (United States)4th Engineer Brigade (Romania)4th Ersatz Division (German Empire)
4th Expeditionary Reconnaissance Squadron4th Field Artillery Regiment4th Field Artillery Regiment (United States)
4th Fighter Aviation Division4th Fighter Aviation Division (People's Liberation Army Air Force)4th Fighter Division (China)
4th Fighter Division (Germany)4th Fighter Division (People's Republic of China)4th Fighter Squadron
4th Fighter Squadron (Commando)4th Fighter Wing4th Fires Brigade (United States)
4th Fleet (Imperial Japanese Navy)4th Foot Guards (German Empire)4th Force Reconnaissance Company
4th Foreign Regiment4th Foreign Regiment (France)4th Frigate Squadron (United Kingdom)
4th Garrison Division of Fuzhou Military Region4th General Hospital (United States Army)4th Georgia Regiment
4th Gorkha Rifles4th Group CIS4th Guards Anti-Aircraft Artillery Division
4th Guards Army4th Guards Brigade4th Guards Brigade (Croatia)
4th Guards Brigade (United Kingdom)4th Guards Cavalry Corps4th Guards Infantry Division (German Empire)
4th Guards Kantemirovskaya Tank Division4th Guards Motor Rifle Division4th Guards Rifle Division
4th Guards Tank Division4th Hazara Pioneers4th Horse (Hodson's Horse)
4th Hussar Regiment (France)4th Illinois Cavalry Regiment4th Illinois Volunteer Infantry Regiment
4th Imperial Family Guards Rifle Regiment (Russian Empire)4th Independent Air Defence Army4th Independent Battery Indiana Light Artillery
4th Independent Battery Wisconsin Light Artillery4th Indian Cavalry Brigade4th Indian Infantry Brigade
4th Infantry4th Infantry Brigade4th Infantry Brigade (Canada)
4th Infantry Brigade (Greece)4th Infantry Brigade (Lebanon)4th Infantry Brigade (New Zealand)
4th Infantry Brigade (South Africa)4th Infantry Brigade (United Kingdom)4th Infantry Brigade Combat Team, 1st Infantry Division (United States)
4th Infantry Brigade and Headquarters North East (United Kingdom)4th Infantry Division (Belgium)4th Infantry Division (Greece)
4th Infantry Division (India)4th Infantry Division (Philippines)4th Infantry Division (Poland)
4th Infantry Division (Romania)4th Infantry Division (Russian Empire)4th Infantry Division (United Kingdom)
4th Infantry Division (United States)4th Infantry Division (Wehrmacht)4th Infantry Division Artillery (United States)
4th Infantry Division Littorio4th Infantry Division Livorno4th Infantry Regiment (France)
4th Infantry Regiment (Imperial Japanese Army)4th Infantry Regiment (United States)4th Iowa Independent Battery Light Artillery
4th Iowa Volunteer Cavalry Regiment4th Iowa Volunteer Infantry Regiment4th Kansas Militia Infantry Regiment
4th Kansas Volunteer Infantry Regiment4th Kentucky Infantry4th Lancashire Artillery Volunteers
4th Land Force Brigade4th Landing Support Battalion4th Landwehr Division (German Empire)
4th Law Enforcement Battalion4th Legion Tercio "Alejandro Farnesio"4th Legions' Infantry Regiment
4th Light Armored Reconnaissance Battalion4th Light Cavalry Division (France)4th Light Cruiser Squadron (United Kingdom)
4th Light Horse Brigade4th Light Horse Regiment (Australia)4th Logistics Battalion (Belgium)
4th Low Altitude Air Defense Battalion4th Luftwaffe Field Division (Germany)4th Machine Gun Battalion (Australia)
4th Madras Native Infantry4th Maine Battery4th Maine Volunteer Infantry Regiment
4th Maintenance Battalion4th Maneuver Enhancement Brigade4th Marching Regiment of the 1st Foreign Regiment
4th Marine Aircraft Wing4th Marine Battalion (South Vietnam)4th Marine Brigade (Iran)
4th Marine Division (United States)4th Marine Expeditionary Brigade4th Marine Infantry Regiment
4th Marine Logistics Group4th Marine Regiment (United States)4th Maryland Regiment
4th Maryland Volunteer Infantry4th Massachusetts Regiment4th Massachusetts Volunteer Cavalry
4th Mechanized Brigade (Kazakhstan)4th Mechanized Brigade (United Kingdom)4th Mechanized Cavalry Brigade (Brazil)
4th Mechanized Corps (Soviet Union)4th Medical Battalion4th Medical Battalion (United States Marine Corps)
4th Michigan Cavalry4th Michigan Volunteer Cavalry Regiment4th Michigan Volunteer Infantry Regiment
4th Michigan Volunteer Infantry Regiment (Reorganized)4th Military District (Australia)4th Military Information Support Group
4th Military Region (Vietnam People's Army)4th Minnesota Volunteer Infantry Regiment4th Missouri Regiment of Colored Infantry
4th Missouri Volunteer Cavalry4th Missouri Volunteer Infantry4th Missouri Volunteer Infantry (3 months, 1861)
4th Mixed Brigade (Imperial Japanese Army)4th Motor Brigade (Australia)4th Motorized Infantry Division (People's Republic of China)
4th Mountain Artillery Regiment (Italy)4th Mountain Division (Wehrmacht)4th Mountain Infantry Division Livorno
4th Mounted Brigade4th Mounted Brigade (United Kingdom)4th Mounted Division
4th Mounted Rifles4th Naval Armaments Supplement Programme
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