Royal Prussian Jagdstaffel 51, commonly abbreviated to Jasta 51, was a "hunting group" (i.e., fighter squadron) of the Luftstreitkräfte, the air arm of the Imperial German Army during World War I. The squadron would score over 24 aerial victories during the war. The unit's victories came at the expense of 10 killed in action, two killed in a mid-air collision, two wounded in action, one injured in an aviation accident, and two taken prisoner of war. A member of this unit was Friedrich Karl Florian Nazi Gauleiter of Düsseldorf, Germany.