Second Army

Second Army or 2nd Army may refer to:

Germany

 * 2nd Army (German Empire), a World War I field army
 * 2nd Army (Wehrmacht), a World War II field army
 * 2nd Panzer Army

Russia / Soviet Union

 * Second Western Army, fought in the French invasion of Russia
 * 2nd Army (Russian Empire), fought at Tannenberg in 1914
 * 2nd Army (RSFSR), fought in the Russian Civil War
 * 2nd Ukrainian Soviet Army, fought in the Russian Civil War
 * 2nd Red Banner Army, a Soviet field army of World War II

Others

 * II Army (Argentina)
 * Second Army (Australia)
 * 2nd Army (Austria-Hungary)
 * Second Army (Bulgaria)
 * Second Army (Egypt)
 * Second Army (France)
 * Second Army (Hungary)
 * Second Army (Italy)
 * Second Army (Japan)
 * Second Army (Ottoman Empire)
 * Second Army (Poland)
 * Second Army (Romania)
 * Second Army (Serbia)
 * Second Army (Turkey)
 * Second Army (United Kingdom)
 * Second Army (Home Forces), also in the United Kingdom
 * 2nd Army (Kingdom of Yugoslavia)
 * Second United States Army