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

Intended as a training tank to introduce the concept of armored warfare to the German Army, its design began in 1932 and mass production in 1934. Despite the original purpose of the vehicle, the Panzer I saw combat in Spain during the Spanish Civil War, in Poland, France, Russia and North Africa during the Second World War, and even in China during the Second Sino-Japanese War. Based on experience gathered during the Spanish Civil War, the Panzer I helped shape the German armored corps which invaded Poland in 1939 and France in 1940. By 1941, Panzer I chassis were being reused for production of tank destroyers and assault guns. There were attempts to upgrade the Panzer I throughout its service history and it continued to serve in the armed forces of Spain until 1954.

Ultimately, the Panzer I's performance in combat was limited by its thin armor and light armament, consisting of only two heavy machine guns. This was to be expected from a tank designed solely for training and the Panzer I was not as capable as other light tanks of the era, such as the T-26. Although weak in combat, it formed a large proportion of Germany's tank strength on paper and was used in all major campaigns between September 1939 and December 1941. Inevitably, the small, vulnerable light tank would be overshadowed in importance by more well known German tanks, such as the Panzer IV, Panther, and Tiger, but its contribution to the early victories of Nazi Germany during the Second World War was significant.

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