The Leopard 2A4 is the most widely produced variant of the German Leopard 2 main battle tank, which entered service in 1985. This version received a new turret with enhanced armor protection, a digital fire control system, and other improvements that increased operational convenience. In addition to serving in Germany, Leopard 2A4 tanks were exported to Hungary, among other countries. In December 2018, the Hungarian Ministry of Defense signed a contract with Krauss-Maffei Wegmann (KMW) to acquire 44 Leopard 2A7+ tanks (designated Leopard 2A7HU) and 12 Leopard 2A4s for crew training. After undergoing repairs and modifications at the Munich facility, all 12 Leopard 2A4 units were delivered to the customer in 2020 and designated Leopard 2A4HU. They were assigned to the 25th Infantry Brigade and the 11th Tank Battalion, where they remain in service to this day.

The Hungarian Leopard 2A4 was introduced in Update 2.29 "Sons of Attila", as a part of the Italian research tree. Compared to the German tank, the Hungarian version differs only in its unique camouflage. In terms of combat performance, the Hungarian Leopard 2A4 is one of the most versatile MBTs at its rank thanks to its excellent mobility and speed, powerful 120 mm Rh 120 L/44 gun with fast reload, decent composite armor, and good survivability due to blow-out panels on the rear of the turret. However, if the tank is loaded with more than 16 rounds, the remaining ammunition is stored in the front hull, which is sometimes insufficiently protected against powerful APFSDS rounds and tandem ATGMs.