A list of American Army Groups in World War II.

• First United States Army Group — Fictitious formation, created as a part of Operation Quicksilver.
• 6th Army Group - Served in France and Germany from 15 September 1944 to 15 June 1945. (Consisted of Seventh United States Army and French First Army)
• 12th Army Group - Served in France and Germany from 1 August 1944 until 12 July 1945. (Consisted of First, Third, Ninth and Fifteenth United States Armies.)
• 15th Army Group — Had overall command of the Allied Armies in Italy. (Consisted of Fifth United States Army and British Eighth Army.)
• 21st Army Group - Not an American unit. (Consisted of British Second Army and Canadian First Army.)

• Military history of the United States during World War II
• United States in World War II (disambiguation)