1st Army
1. Army means the following major units:
- 1st Army (German War)
- 1st Army (Franco-German War)
- 1st Army (German Empire) , association in the First World War
- 1st Army (Wehrmacht) , Army in World War II
- 1st Army (Romania) , unit in the First and Second World Wars
- 1st Army (Russian Empire) , unit in the First World War
- First United States Army , an association of the US Army that has existed with one interruption since 1918
- 1st Army (Japanese Empire) (Japanese 第 1 軍, Dai-ichi-gun) was a major unit of the Imperial Japanese Army
- 1st Regional Army , Union of the Imperial Japanese Army
- First Army (United Kingdom) , armies in both world wars
- 1ere armée (France) , armies in both world wars
- 1ere armée (1944–1945) , army in World War II
- 1st Army (Bulgaria)
- 1st Army (Austria-Hungary) , unit in the First World War
- 1st Army (Turkey)
- 1st Army (Ottoman Empire) , Association of the Ottoman Army between 1877 and 1918
- 1st Army (Red Army) , Association of the Red Army
- 1st Armored Guard Army , Association of the Red Army
- First Canadian Army
- 1ª Armata , Italian army in both world wars
See also:
- 1st Panzer Army (Wehrmacht)
- 1st Panzer Army (Red Army) , later 1st Guards Tank Army renamed
- 1st Shock Army , Union of the Red Army
- 1st Air Army (Red Army) , Union of Soviet Air Forces
- 1st Parachute Army of the German Wehrmacht
- First Allied Airborne Army , association in the closing stages of the Second World War
- 1st Red Cavalry Army , Union in the Russian Civil War
- 1st Air Army (Japanese Empire) , Association of the Imperial Japanese Army Air Forces
