3rd Army
Active	1912–1919
Country	Kingdom of Serbia
Type	Army
Engagements	First Balkan War First World War Serbian Campaign Salonika front
Commanders
Notable commanders	Božidar Janković Pavle Jurišić Šturm Miloš Vasić

The Third Army (Serbian: Трећа армија/Treća armija) was a field army of the Army of the Kingdom of Serbia that fought during the Balkan Wars and World War I.

During the First Balkan War, the Third Army participated in the Battle of Kumanovo (23 - October 24, 1912) along with the Serbian First Army and the Serbian Second Army. It was composed of four infantry divisions and one infantry brigade (76,000 men), deployed in two groups, the first one at Toplica and the second one at Medveđa. It was assigned to the westernmost attack, with the task of taking Kosovo and then moving south to attack the left flank of the Ottoman Army.

At the start of World War I, the Third Army under the command of General Pavel Jurišić Šturm, took up positions on the northwestern border from the mouth of the Kolubara River to Ljubovia with the Drina Division of the first levy in the vicinity of Valjevo.^[1]

The Third Army fought in the successful Battles of Cer, Drina and Kolubra in 1914. But in Autumn 1915 they were defeated by German-Bulgarian forces during the Kosovo Offensive.
The Third Army was reestablished at the Macedonian front in 1916 and fought several battles against the Bulgarians, until it was disbanded on 28 March 1917.^[2]

Pavle Jurišić Šturm remained commander of the Third Army until August 1916, when he was replaced by Miloš Vasić.

Commander : Pavle Jurišić Šturm

• First Army (Serbia)
• Second Army (Serbia)