I Corps, 1st Corps, or First Corps may refer to:
France
- 1st Army Corps (France)
- I Cavalry Corps (Grande Armée), a cavalry unit of the Imperial French Army during the Napoleonic Wars
- I Corps (Grande Armée), a unit of the Imperial French Army during the Napoleonic Wars
Germany
- I Cavalry Corps (German Empire), a unit of the Imperial German Army
- I Corps (German Empire), a unit of the Imperial German Army
- I Reserve Corps (German Empire), a unit of the Imperial German Army
- I Royal Bavarian Corps, a unit of the Bavarian Army and the Imperial German Army
- I Royal Bavarian Reserve Corps, a unit of the Bavarian Army and the Imperial German Army
- I Army Corps (Wehrmacht), a unit in World War II
- I SS Panzer Corps, a unit in World War II
India
Russia and Soviet Union
- 1st Army Corps (Russian Empire)
- 1st Guards Assault Aviation Corps
- 1st Guards Mechanized Corps (Soviet Union)
- 1st Airborne Corps (Soviet Union)
- 1st Army Corps (Armed Forces of South Russia), a unit in the Russian Civil War
- 1st Army Corps (Soviet Union)
- 1st Assault Aviation Corps
- 1st Cavalry Corps (Russian Empire)
- 1st Rifle Corps, Soviet Union
United Kingdom
United States
- I Corps (United States)
- I Amphibious Corps
- I Armored Corps (United States)
- I Corps (Union Army)
- First Corps, Army of Northern Virginia
- First Corps, Army of Tennessee
- First Army Corps (Spanish-American War)
- I Field Force, Vietnam
Others
- I ANZAC Corps, Australia and New Zealand
- I Corps (Australia)
- I Corps (Belgium)
- I Corps (Bosnia and Herzegovina)
- I Canadian Corps
- I Corps (Czechoslovakia)
- Finnish I Corps (Winter War)
- I Army Corps (Greece)
- I Corps (North Korea)
- I Corps (Ottoman Empire)
- I Corps (Pakistan)
- I Corps (Sri Lanka)
- Polish I Corps (disambiguation), several units
- 1st Territorial Army Corps (Romania)
- I Corps (South Korea)
- I Corps (South Vietnam)
- 1st Corps (Syria)
- 1st Corps (Vietnam People's Army)
- 1st Corps (Yugoslav Partisans), during World War II
See also
- List of military corps by number
- 1st Army Corps (disambiguation)
- 1st Army (disambiguation)
- 1st Brigade (disambiguation)
- 1st Division (disambiguation)
- 1st Regiment (disambiguation)
- 1 Squadron (disambiguation)
Topics referred to by the same termThis disambiguation page lists articles about military units and formations which are associated with the same title. If an internal link referred you to this page, you may wish to change the link to point directly to the intended article.
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