Fourteenth Army or 14th Army may refer to:
- 14th Army (German Empire), a World War I field Army
- 14th Army (Wehrmacht), a World War II field army
- Italian Fourteenth Army
- Japanese Fourteenth Army, a World War II field army, in 1944 converted to Japanese Fourteenth Area Army
- 14th Army (Soviet Union)
- Soviet 14th Guards Army, which occupied Moldovan Transnistria during the Transnistria War
- Fourteenth Army (United Kingdom)
- Fourteenth United States Army, a World War II 'phantom' force