Twelfth Army
Twelfth Army or 12th Army may refer to:
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Germany
- 12th Army (German Empire), a unit in World War I
- 12th Army (Wehrmacht), a unit in World War II
Russia
- 12th Army (Russian Empire), a unit in World War I
- 12th Army (RSFSR), a Red Army unit in the Russian Civil War
- 12th Army (Soviet Union), a unit of the Soviet Army
Other countries
- Twelfth Army (Japan), a unit of the Imperial Japanese Army
- Twelfth Army (United Kingdom), a unit of the British Army
- Twelfth Army (Italy), a unit in World War I
- 12th Army (Austria-Hungary), a unit in World War I