Formations of the United States Army

This is a list of historical formations of the United States Army. Units still in existence are in bold.

For specific eras:
 * Formations of the United States Army during the Mexican Revolution
 * Formations of the United States Army during World War I
 * Formations of the United States Army during World War II
 * Formations of the United States Army during the Vietnam War
 * Formations of the United States Army during the War on Terrorism
 * Formations of the United States Army (current)

Army groups

 * 1st Army Group (World War II "phantom" formation)
 * 6th Army Group
 * 12th Army Group
 * 15th Army Group

Field armies

 * First Allied Airborne Army
 * First United States Army—U.S. Army Training, Readiness, and Mobilization command formation
 * Second United States Army
 * Third United States Army—United States Army Central command formation
 * Fourth United States Army
 * Fifth United States Army—United States Army North command formation
 * Sixth United States Army—United States Army South command formation
 * Seventh United States Army—United States Army Europe command formation
 * Eighth United States Army—United States Army Korea command formation
 * Ninth United States Army
 * Tenth United States Army
 * Fourteenth United States Army (World War II "phantom" formation)
 * Fifteenth United States Army

Army corps
Airborne, armored, and infantry are grouped separately. The numbering system for the airborne corps is a continuation of the infantry numbering system.

Airborne corps

 * XVIII Airborne Corps

Armored corps

 * I Armored Corps (Now the Seventh Army)
 * II Armored Corps (Now the XVIII Airborne Corps)
 * III Armored Corps (Now the III Corps)
 * IV Armored Corps

Army corps

 * I Corps
 * II Corps
 * III Corps
 * IV Corps
 * V Corps


 * VI Corps
 * VII Corps
 * VIII Corps
 * IX Corps
 * X Corps


 * XIII Corps
 * XIV Corps
 * XV Corps
 * XVI Corps
 * XVII Corps


 * XIX Corps
 * XX Corps
 * XXI Corps
 * XXII Corps
 * XXIII Corps


 * XXIV Corps
 * XXXVI Corps (1944–1945)

Air assault divisions

 * 11th Air Assault Division (Test) (1963–1965)

Airborne divisions

 * 6th Airborne Division (phantom World War II division)
 * 9th Airborne Division (phantom World War II division)
 * 11th Airborne Division "Angels"
 * 13th Airborne Division "Lucky Thirteenth"
 * 15th Airborne Division (unorganized World War II division)
 * 17th Airborne Division "Golden Talons"
 * 18th Airborne Division (phantom World War II division)
 * 21st Airborne Division (phantom World War II division)
 * 80th Airborne Division (1946–1952)
 * 82nd Airborne Division "All American"
 * 84th Airborne Division (1946–1952)
 * 100th Airborne Division (1946–1952)
 * 101st Airborne Division "Screaming Eagles"
 * 108th Airborne Division (1946–1952), Later Division was Army Reserve Division, serving as in Infantry and later Training missions
 * 135th Airborne Division (phantom World War II division)

Armored divisions

 * 1st Armored Division "Old Ironsides"
 * 2nd Armored Division "Hell On Wheels"
 * 3rd Armored Division "Spearhead Division"
 * 4th Armored Division "Breakthrough Division"
 * 5th Armored Division "Victory"
 * 6th Armored Division "Super Sixth", "Bulgebusters"
 * 7th Armored Division "Lucky Seventh"
 * 8th Armored Division "Showhorse"
 * 9th Armored Division "The Phantom Division"
 * 10th Armored Division "Tiger Division"
 * 11th Armored Division "Thunderbolt Division"
 * 12th Armored Division "Hellcat Division"
 * 13th Armored Division
 * 14th Armored Division
 * 15th Armored Division (phantom World War II division)
 * 16th Armored Division
 * 18th Armored Division (unorganized World War II division)
 * 19th Armored Division (unorgainzed World War II division)
 * 20th Armored Division
 * 21st Armored Division (unorganized World War II division)
 * 22nd Armored Division (unorganized World War II division)
 * 25th Armored Division (phantom World War II division)
 * 27th Armored Division
 * 30th Armored Division
 * 39th Armored Division (phantom World War II division) (possible post war Armored Brigade, not division)
 * 40th Armored Division
 * 48th Armored Division (Georgia Army National Guard to 1967)
 * 49th Armored Division "Lone Star" TX ARNG (1946–68, 1973–2004)
 * 50th Armored Division "Jersey Blues" NJ ARNG (up to early 1990s)

Cavalry divisions

 * Cavalry Division—authorized as the 4th Regular Army division in 1913; never officially numerically designated.
 * 1st Cavalry Division
 * 2nd Cavalry Division
 * 3rd Cavalry Division
 * 15th Cavalry Division (Later redesignated as 1st Cavalry Division)
 * 21st Cavalry Division
 * 22nd Cavalry Division
 * 23rd Cavalry Division
 * 24th Cavalry Division
 * 61st Cavalry Division
 * 62nd Cavalry Division
 * 63rd Cavalry Division
 * 64th Cavalry Division
 * 65th Cavalry Division
 * 66th Cavalry Division

Infantry divisions

 * 1st Infantry Division "The Big Red One"
 * 2nd Infantry Division "Indian Head Division"
 * 3rd Infantry Division "Rock of the Marne"
 * 4th Infantry Division "Ivy Division", "Iron Horse"
 * 5th Infantry Division "Red Diamond"
 * 6th Infantry Division "Red Star"
 * 7th Infantry Division "Bayonet Division"
 * 8th Infantry Division "Pathfinders", "Golden Arrow"
 * 9th Infantry Division "Octfoil", "Old Reliables"
 * 10th Division (World War I)
 * 10th Mountain Infantry Division (1943–1957)
 * 11th Division (World War I)
 * 12th Division (World War I)
 * 12th Infantry Division "Philippine division"
 * 13th Division "Lucky 13 Division" (World War I)
 * 14th Division (World War I)
 * 14th Infantry Division (phantom World War II division)
 * 15th Division (World War I)
 * 16th Division (World War I)
 * 17th Division (World War I)
 * 18th Division (World War I)
 * 19th Division "Moon & Star"
 * 19th Infantry Division (phantom World War II division)
 * 20th Division (World War I)
 * 22nd Infantry Division (phantom World War II division)
 * 23rd Infantry Division "Americal Division"
 * 24th Infantry Division "Victory Division"
 * 25th Infantry Division "Tropic Lightning"
 * 26th Infantry Division "Yankee Division"
 * 27th Infantry Division "New York Division"
 * 28th Infantry Division "Keystone Division"
 * 29th Infantry Division "The Blue and Gray"
 * 30th Infantry Division "Old Hickory"
 * 31st Infantry Division "Dixie Division"
 * 32nd Infantry Division "Red Arrow"
 * 33rd Infantry Division "Prairie Division"
 * 34th Infantry Division "Red Bull Division"
 * 35th Infantry Division "Santa Fe Division"
 * 36th Infantry Division "Texas Division"
 * 37th Infantry Division "Buckeye Division"
 * 38th Infantry Division "Cyclone Division"
 * 39th Infantry Division "Delta Division"
 * 40th Infantry Division "Sunburst Division"
 * 41st Infantry Division "Sunset Division"
 * 42nd Infantry Division "Rainbow Division"
 * 43rd Infantry Division "Red Wing Division"
 * 44th Infantry Division
 * 45th Infantry Division "Thunderbird Division"
 * 46th Infantry Division (United States) (phantom World War II division, postwar National Guard formation)
 * 47th Infantry Division (Post-war National Guard Division nicknamed "Viking")
 * 48th Infantry Division (United States) (phantom World War II division, postwar National Guard formation)
 * 49th Infantry Division (Post-war National Guard Division nicknamed "49'ers")
 * 50th Infantry Division (phantom World War II division)
 * 51st Infantry Division (Post-war National Guard Division)
 * 52nd Infantry Division
 * 55th Infantry Division (phantom World War II division)
 * 59th Infantry Division (phantom World War II division)
 * 61st Infantry Division (unorganized World War II division)
 * 62nd Infantry Division (unorganized World War II division)
 * 63rd Infantry Division
 * 65th Infantry Division
 * 66th Infantry Division
 * 67th Infantry Division (unorganized World War II division)
 * 68th Infantry Division (unorganized World War II division)
 * 69th Infantry Division
 * 70th Infantry Division "Trailblazers"
 * 71st Infantry Division "Red Circle"
 * 72nd Infantry Division (unorganized World War II division)
 * 73rd Infantry Division (unorganized World War II division)
 * 74th Infantry Division (unorganized World War II division)
 * 75th Infantry Division
 * 76th Infantry Division "Liberty Bell Division"
 * 77th Infantry Division "Metropolitan Division" also "Statue of Liberty Division"
 * 78th Infantry Division "Lightning Division"
 * 79th Infantry Division "Liberty Division"
 * 80th Infantry Division "Blue Ridge Division"
 * 81st Infantry Division "Wildcat Division"
 * 82nd Infantry Division "All American Division" (Later Airborne Division with same number)
 * 83rd Infantry Division "Thunderbolt Division"
 * 84th Infantry Division "Railsplitters"
 * 85th Infantry Division "Custer Division"
 * 86th Infantry Division "Blackhawk Division"
 * 87th Infantry Division "Golden Acorn"
 * 88th Infantry Division "Blue Devils"
 * 89th Infantry Division "Rolling W Division"
 * 90th Infantry Division "Tough Ombres"
 * 91st Infantry Division "Wild West"
 * 92nd Infantry Division "Buffalo Division"
 * 93rd Infantry Division "Blue Helmets"
 * 94th Infantry Division "Neuf-Cats"
 * 95th Infantry Division "Ironman Division" (Also "Victory Division", and "Iron Men of Metz Division")
 * 96th Infantry Division "Deadeye Division"
 * 97th Infantry Division "Trident Division"
 * 98th Infantry Division "Iroquois"
 * 99th Infantry Division "Checkerboard Division"
 * 100th Infantry Division "Century"
 * 101st Division (Later Airborne Division with same number)
 * 102nd Infantry Division "Ozark Division"
 * 103rd Infantry Division "Cactus Division"
 * 104th Infantry Division "Timberwolf"
 * 105th Infantry Division (unorganized World War II division)
 * 106th Infantry Division "Golden Lion Division"
 * 107th Infantry Division (unorganized World War II division)
 * 108th Infantry Division {phantom World War II Division}
 * 108th Infantry Division "Golden Griffons" (Formerly Airborne Division of same number)
 * 109th Infantry Division (phantom World War II division)
 * 112th Infantry Division (phantom World War II division)
 * 119th Infantry Division (phantom World War II division)
 * 125th Infantry Division (phantom World War II division)
 * 130th Infantry Division (phantom World War II division)
 * 141st Infantry Division (phantom World War II division)
 * 157th Infantry Division (phantom World War II division)
 * Americal Division (see 23rd Infantry Division)
 * Hawaiian Division (see also: 24th Infantry Division; 25th Infantry Division)
 * Maneuver Division (1911)
 * Panama Canal Division (inactivated 1932)
 * Philippine Division (see 12th Infantry Division)

Light divisions

 * 10th Light Division (Alpine)
 * 71st Light Division (Truck)
 * 89th Light Division (Pack)

Mountain divisions

 * 10th Mountain Division

Reserve training divisions

 * 75th Division
 * 78th Division "Lightning Division"
 * 80th Division "Blue Ridge Division"
 * 84th Division "Lincoln County Division"
 * 85th Division "Custer Division"
 * 87th Division "Golden Acorn Division"
 * 91st Division "Wild West Division"
 * 95th Division "Victory Division"
 * 98th Division "Iroquois Division"
 * 100th Division "Century Division"
 * 104th Division "Timberwolf Division"
 * 108th Division "Golden Griffons"