The E-50 Standardpanzer was an experimental German WWII Main Battle Tank that never entered mass production. It was probably armed with a 88mm KwK 43 L / 71 gun and 1 or 2 machine guns. MG34 or MG42 cal. 7.92 mm.

Design work on the E-50 tank was initiated in as part of the Entwicklungsserie program, i.e. a program for the development of German armor, which was to lead to the creation of a standardized design for a series of six combat vehicles of different weights, but using as many common components as possible. Analytical and conceptual work under this program was initiated in mid-1943. The E-50 tank in this project was to be the main tank of the German army, fulfilling a universal role on the battlefield, i.e. having the mobility of a medium tank, but the firepower of a heavy tank. The hull and chassis of the E-50 were to be largely based on that used in the Pz.Kpfw. VI Tiger II, while the turret was to come from another experimental tank – the Panther Ausf. F – the so-called Schmallturm. Ultimately, the E-50 was to replace the Pz.Kpfw V Panther and the Pz.Kpfw VI Tiger tanks in the line.