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. It served on the Western Front until September 1917, transferred directly to the Italian Front to serve until March 1918, then returned to France for the rest of the war.