The 3rd Army was a Royal Yugoslav Army formation commanded by Armijski đeneral Ilija Brašić during the German-led Axis invasion of the Kingdom of Yugoslavia in April 1941 during World War II.

The 22nd Infantry Division Ibarska was to be held as the 3rd Army Group reserve around Skopje.

On the right was the Adriatic coast defended by the Coastal Defence Command, with the boundary running north from the Bay of Kotor.

The Yugoslav defense plan saw the 3rd Army deployed in a horseshoe around northern Albania.

[5] All 3rd Army formations except the 13th Infantry Division Hercegovačka were to be deployed in a cordon.