Fourth Army

A number of nations have had a Fourth Army

Germany

 * 4th Army (German Empire), a World War I field Army
 * 4th Army (Wehrmacht), a World War II field army
 * 4th Panzer Army

Others

 * Fourth Army (United Kingdom)
 * Republic of China: Fourth Army (National Revolutionary Army) and New Fourth Army
 * Fourth Army (France)
 * Fourth Army (Ottoman Empire)
 * 4th Infantry Division (Romania)
 * 4th Army (Soviet Union)
 * Soviet and later Russian 4th Air Army
 * 4th Guards Army (Soviet Union)
 * 20th Guards Army, Soviet Fourth Tank Army
 * Fourth United States Army
 * Fourth Army (Bulgaria)