First Army

First Army may refer to:

Germany

 * 1st Army (German Empire), a World War I field Army
 * 1st Army (Wehrmacht), a World War II field army
 * 1st Panzer Army
 * 1st Parachute Army (Germany)

Others

 * First Army (Australia)
 * First Army (Austria-Hungary)
 * First Army (United Kingdom)
 * First Army (Bulgaria)
 * First Canadian Army
 * Republic of China New First Army
 * First Czechoslovak Army in Slovakia
 * First Army (France)
 * First Army (Greece)
 * First Army (Hungary)
 * First Army (Italy)
 * First Army (Japan)
 * First Army (Ottoman Empire)
 * First Polish Army (1920)
 * First Polish Army (1944-1945)
 * First Army (Romania)
 * First Army (Russian Empire)
 * First Army (Serbia)
 * 1st Red Banner Army (Soviet Union)
 * First Army (Turkey)
 * First United States Army
 * First Army (Yugoslavia)