Royal Prussian Jagdstaffel 1 (commonly abbreviated as Jasta 1) was a fighter squadron of the Luftstreitkräfte, the air arm of the Imperial German Army during World War I. Jasta 1 was founded on 22 August 1916, using single seat fighters drawn from First Army. It was one of the first wave of dedicated fighter squadrons founded as a result of Oswald Boelcke's espousal of massing fighter air power. Leopold Reimann scored the first of its 138 aerial victories two days later.