4th Infantry Regiment (United States)
4th Infantry Division (United States)
4th Missouri Infantry Regiment
4th Infantry Division (Poland)
4th Infantry Division (India)
4th Infantry Regiment (Lithuania)
4th Minnesota Infantry Regiment
4th Infantry Division "Livorno"
4th Infantry
4th Infantry Division (United Kingdom)
4th Punjab Infantry Regiment
4th Brigade Combat Team, 1st Infantry Division
4th Canadian Infantry Brigade
4th Infantry Division (Wehrmacht)
4th Delaware Infantry Regiment
4th Infantry Division Artillery (United States)
4th Infantry Division (Philippines)
4th Maine Infantry Regiment
4th New Hampshire Infantry Regiment
4th Michigan Infantry Regiment
4th Michigan Infantry Regiment (Reorganized)
4th California Infantry Regiment
4th Infantry Brigade
4th Ohio Infantry Regiment
4th Infantry Brigade (United Kingdom)
4th Kansas Infantry Regiment
4th United States Colored Infantry Regiment
4th Kansas Militia Infantry Regiment
4th Division
4th Brigade Combat Team, 2nd Infantry Division
4th Vermont Infantry Regiment
4th Mechanised Infantry Brigade (Turkey)
4th West Virginia Infantry Regiment
4th Regiment of Bengal Native Infantry
4th Kentucky Infantry Regiment (Confederate)
4th Light Brigade Combat Team
4th Infantry Division Littorio
4th New Jersey Infantry Regiment
4th Kentucky Infantry Regiment (Union)
4th Connecticut Infantry Regiment
4th Arkansas Infantry Regiment
4th Line Infantry Regiment (Congress Poland)
4th Prince Albert Victor's Rajputs
4th Maryland Infantry Regiment
4th Missouri Infantry Regiment (Confederate)
4th Wisconsin Infantry Regiment
4th Iowa Infantry Regiment
4th Tank Regiment (Italy)
4th Bombay Native Infantry
4th Rhode Island Infantry Regiment
4th Arkansas Infantry Regiment (Union)
4th Guards Infantry Division (German Empire)
4th Pennsylvania Infantry Regiment
4th Canadian Division
4th Regiment
4th Louisiana Native Guard Infantry Regiment
4th Missouri Infantry Regiment (Union, 3 months)
4th Division (North Korea)
97th Deccan Infantry
1st and 4th Missouri Infantry Regiment (Consolidated)
4th Brigade (Australia)
2nd Infantry Brigade Combat Team (Airborne), 11th Airborne Division
4th New York Infantry Regiment
4th Battalion, 17th Infantry Regiment (United States)
4th Virginia Infantry Regiment
4th Infantry Division (Thailand)
4th Royal Bavarian Division
4th Missouri Colored Infantry Regiment
4th South Carolina Volunteer Infantry Regiment (Colored)
List of commanders of 4th Infantry Division (United States)
54th Sikhs (Frontier Force)
4th Infantry Division (Belgium)
4th Madras Native Infantry
140th (4th London) Brigade
4th Division (Iraq)
63rd Palamcottah Light Infantry
4th Infantry Battalion (Ireland)
106th United States Colored Infantry Regiment
4th Moroccan Mountain Division
4th Division (Imperial Japanese Army)
92nd Punjabis
4th North African Infantry Division
64th Pioneers
44th Massachusetts Infantry Regiment
3rd U.S. Infantry Regiment (The Old Guard)
4th Combat Aviation Brigade
4th Infantry Brigade (Greece)
2/4th Battalion (Australia)
4th North Carolina Infantry Regiment
4th Infantry Regiment (France)
4th Marine Infantry Regiment
104th Wellesley's Rifles
4th Infantry Division (Russian Empire)
4th Legions' Infantry Regiment
4th Brigade Combat Team, 4th Infantry Division (United States)
4th Arkansas Infantry Battalion
4th Illinois Volunteer Infantry Regiment
3rd Infantry Division (United States)
4th Infantry Brigade (Georgia)
1st Infantry Division (United States)
4th Massachusetts Militia Regiment
4th SA Infantry Regiment
4th Infantry Brigade (New Zealand)
4th Royal Lancashire Militia (The Duke of Lancaster's Own Light Infantry)
4th Tennessee Infantry Regiment
4th Indian Infantry Brigade
4th Mississippi Infantry Regiment
4th Infantry Division (Romania)
227th Infantry Brigade (United Kingdom)
4th Wisconsin Infantry Regiment (1898)
4th Motorized Infantry Division (People's Republic of China)
4th Ranger Infantry Company (United States)
107th Pioneers
4th Louisiana Infantry Regiment (Confederate)
57th United States Colored Infantry Regiment
4th Texas Infantry Regiment
4th Infantry Division (Greece)
3rd Brigade Combat Team, 10th Mountain Division
4th Infantry Brigade (South Africa)
4th New Guinea Infantry Battalion
4th Missouri Infantry Regiment (Union, 3 years)
4th Infantry Regiment (Imperial Japanese Army)
4th Louisiana Infantry Battalion
Loyal Edmonton Regiment
224th Brigade (United Kingdom)
4th Infantry Brigade (Lebanon)
231st Brigade (United Kingdom)
King's Own (3rd Staffordshire) Rifle Militia
43rd Sustainment Brigade
Combat Aviation Brigade, 1st Infantry Division (United States)
2nd Somerset Militia
4th Colonial Infantry Division (France)
Estonian Land Forces
City of Bristol Rifles
258th Field Artillery Regiment
1st Northamptonshire Rifle Volunteer Corps
Royal Carnarvon Rifles
6th Royal Lancashire Militia
Londonderry Militia
1st Durham Rifle Volunteers
101st Airborne Division
7th Royal Lancashire Militia (Rifles)
King's Own (1st Staffordshire) Militia
North York Rifle Militia
2nd Rifle Division (Soviet Union)
Royal Montgomeryshire Militia
Public Schools Battalions
Hull Pals
20th Battalion, London Regiment (Blackheath and Woolwich)
Royal London Militia
Surrey Militia
19th Battalion, London Regiment (St Pancras)
East Kent Militia
Royal Pembroke Militia
1st Dorsetshire Artillery Volunteers