The Panzer I was a light tank produced in Germany in the 1930s. The name is short for the German Panzerkampfwagen I("armored fighting vehicle mark I"), abbreviated 'PzKpfw I'. The tank's official German ordnance inventory designation was SdKfz 101 ("special purpose vehicle 101").


The Panzer I's performance in armored combat was limited by its thin armour and light armament of two machine guns, which were never intended for use against armoured targets, rather being ideal for infantry suppression, in line with inter-war doctrine. As a design intended for training, the Panzer I was less capable than some other contemporary light tank designs, such as the Soviet T-26, although it was still relatively advanced compared to older designs, such as the Renault FT, still in service in several nations, and others. Although lacking in armoured combat as a tank, it formed a large part of Germany's mechanized forces and was used in all major campaigns between September 1939 and December 1941, where it still performed much useful service against entrenched infantry and other "soft" targets, which were unable to respond even against thin armor, and who were highly vulnerable to machine gun fire. The small, vulnerable light tank, along with its somewhat more powerful successor the Panzer II, would soon be surpassed as a front-line armoured combat vehicle by more powerful German tanks, such as the Panzer III, and later the Panzer IV, Panzer V, and Panzer VI; nevertheless, the Panzer I's contribution to the early victories of Nazi Germany during World War II was significant. Later in that war the turrets of many of the then-obsolete PzKpfw Is and PzKpfw IIs were repurposed as gun turrets on specially built defensive bunkers, particularly on the Atlantic Wall.
