Eastern Army

Eastern Army may refer to:


 * Eastern Army (Japan), an active army of the Japan Ground Self-Defense Force
 * Eastern Army (Ottoman Empire), active during the First Balkan War
 * Eastern Army (United Kingdom), active during the Burma Campaign of the Second World War
 * Eastern Army (Spain), active during the Spanish Civil War
 * The forces of the Tokugawa shogunate during the Siege of Osaka