Formations of the United States Army during World War I

This is a list of formations in the United States Army during World War I. Many of these formations still exist today, though many by different designations.

Field Armies

 * First United States Army
 * Second United States Army
 * Third United States Army

Ambulance corps

 * U.S. Ambulance Corps

Motor transport Corps

 * The Motor Transport Corps of the United States Army during World War 1

Army corps

 * I Corps
 * II Corps
 * III Corps
 * IV Corps
 * V Corps
 * VI Corps
 * VII Corps
 * VIII Corps
 * IX Corps

Tank corps

 * United States Tank Corps

Signal Corps

 * List of American Aero Squadrons
 * List of American Balloon Squadrons

Cavalry Divisions

 * 15th Cavalry Division

Infantry Divisions

 * 1st Division ("The Big Red One")
 * 2nd Division ("Indian Head Division"; "Warrior Division")
 * 3rd Division ("Rock of the Marne")
 * 4th Division ("Ivy Division")
 * 5th Division ("Red Devils"; "Red Diamond")
 * 6th Division ("Red Star")
 * 7th Division ("Bayonet Division"; "Lightfighters")
 * 8th Division ("Golden Arrow Division"; "Pathfinder Division")
 * 9th Division ("Old Reliables"; "Hitler's Nemesis")
 * 10th Division
 * 11th Division
 * 12th Division
 * 13th Division ("Lucky 13th")
 * 14th Division
 * 15th Division
 * 16th Division
 * 17th Division
 * 18th Division
 * 19th Division
 * 20th Division
 * 26th Division
 * 27th Division
 * 28th Division
 * 29th Division
 * 30th Division
 * 31st Division
 * 32nd Division
 * 33rd Division
 * 34th Division
 * 35th Division
 * 36th Division
 * 37th Division
 * 38th Division
 * 40th Division
 * 41st Division
 * 42nd Division ("Rainbow Division")
 * 76th Division ("Liberty Bell Division"; "Onaway Division")
 * 77th Division ("Statue of Liberty Division")
 * 78th Division ("Lightning Division")
 * 79th Division ("Cross of Lorraine Division")
 * 80th Division ("Blue Ridge Division")
 * 81st Division ("Wildcat Division")
 * 82nd Division ("All-Americans")
 * 83rd Division ("Thunderbolt Division"; "Ohio Division")
 * 84th Division ("Railsplitters")
 * 85th Division ("Custer Division")
 * 86th Division ("Blackhawk Division")
 * 87th Division ("Golden Acorn Division")
 * 88th Division ( Fighting Blue Devils"; "Clover Leaf Division")
 * 89th Division ("Rolling W")
 * 90th Division ("Tough 'Ombres")
 * 91st Division ("Pine Tree Division"; "Wild West Division")
 * 92nd Division (Colored) ("Buffalo Soldiers")
 * 93d Division (Colored) ("Blue Helmets")
 * 95th Division
 * 96th Division
 * 97th Division
 * 98th Division
 * 99th Division
 * 100th Division
 * 101st Division
 * 102nd Division