Others
- Ninth Army (United Kingdom), a formation of the British Army during World War II
- Ninth Army (France), a field army of the French Army during World War I and World War II
- Ninth Army (Ottoman Empire), one of the field armies of the Ottoman Army formed during World War I
- Ninth United States Army, one of the main U.S. Army combat commands used during the campaign in Northwest Europe in 1944 and 1945.
- 9th Army (Soviet Union), of the Soviet Union's Red Army was a Soviet field army, active from 1939 – 43, and then after the war from 1966 to 1989
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