I Corps

List of military corps &mdash; List of military corps by number &mdash; List of military corps by name

1 Corps, 1st Corps, First Corps, or I Corps may refer to:
 * I ANZAC Corps (Australia and New Zealand)
 * I Corps (Australia)
 * I Corps (Belgium)
 * I Corps (British India)
 * I Corps (Czechoslovakia)
 * I Corps (France)
 * I Cavalry Corps (German Empire), a unit of the Imperial German Army during World War I
 * I Corps (German Empire), a unit of the Imperial German Army prior to and during World War I
 * I Reserve Corps (German Empire), a unit of the Imperial German Army during World War I
 * I Royal Bavarian Corps, a unit of the Bavarian and Imperial German Armies prior to and during World War I
 * I Royal Bavarian Reserve Corps, a unit of the Bavarian and Imperial German Armies during World War I
 * I Corps (Grande Armée)
 * I Corps (India)
 * I Corps (North Korea)
 * I Corps (Ottoman Empire)
 * I Corps (Pakistan)
 * I Corps (South Korea)
 * I Corps (South Vietnam)
 * I Corps (Union Army)
 * I Corps (United Kingdom)
 * I Corps (United States)
 * I Army Corps (Germany)
 * I Army Corps (Greece)
 * I Amphibious Corps
 * I Canadian Corps
 * 1st Territorial Army Corps (Romania)
 * I Airborne Corps (United Kingdom)
 * I Armored Corps (United States)
 * I Field Force, Vietnam (United States)
 * Soviet 1st Guards Mechanized Corps
 * 1st Corps of the Army of the Republic of Bosnia and Herzegovina
 * I SS Panzer Corps
 * Finnish I Corps (Winter War)
 * Polish I Corps (disambiguation)
 * First Corps, Army of Northern Virginia
 * First Corps, Army of Tennessee
 * 1st Corps (Vietnam People's Army), North Vietnam