Organized 24 February 1918 at Montreuil, France as Headquarters II Army Corps.
Inactivated 1 February 1919 at Le Mans, France.
Redesignated 15 August 1927 as Headquarters, XXI Corps.
Redesignated 13 October 1927 as Headquarters, II Corps.
Activated 1 August 1940 at Fort Jay, New York.
Redesignated 1 January 1941 as Headquarters, II Army Corps.
Redesignated 19 August 1942 as Headquarters, II Corps.
Inactivated 10 October 1945 in Austria.
Major General Mark W. Clark - Assumed command July 1942
Major General Lloyd W. Fredendall - Assumed command October 1942
Major General George S. Patton Jr. - Assumed command March 1943
Major General Omar N. Bradley - Assumed command April 1943
Major General John P. Lucas - Assumed command September 1943
Major General Geoffrey Keyes - Assumed command September 1943
Algeria-French Morocco (with arrowhead), Tunisia, Sicily (with arrowhead), Naples-Foggia, Rome-Arno, North Apennines, Po Valley