The 1st Division (1. Division) was a unit of the Prussian/German Army. It was formed in Königsberg in March 1816 as a Troop Brigade (Truppen-Brigade). It became the 1st Division on September 5, 1818. From the corps' formation in 1820, the division was subordinated in peacetime to I Army Corps (I. Armeekorps). The 1st Division was disbanded in 1919, during the demobilization of the German Army after World War I.