Third Army
- 3 Squadron (disambiguation)
- 3rd Army (Austria-Hungary)
- 3rd Army (France)
- 3rd Army (German Empire)
- 3rd Army (RSFSR)
- 3rd Army (Russian Empire)
- 3rd Army (South Korea)
- 3rd Army (Soviet Union)
- 3rd Army (Wehrmacht)
- 3rd Army Corps (disambiguation)
- 3rd Battalion (disambiguation)
- 3rd Brigade (disambiguation)
- 3rd Combined Arms Army
- 3rd Division (disambiguation)
- 3rd Panzer Army
- 3rd Regiment (disambiguation)
- Third Army (Bulgaria)
- Third Army (Egypt)
- Third Army (Home Forces)
- Third Army (Hungary)
- Third Army (Italy)
- Third Army (Japan)
- Third Army (Ottoman Empire)
- Third Army (Romania)
- Third Army (Serbia)
- Third Army (Turkey)
- Third Army (United Kingdom)
- United States Army Central