Leutnant Helmut Dilthey IC (9 February 1894 - 9 July 1918) was a German pilot who became a World War I flying ace credited with seven aerial victories.Dilthey was one of the first German military aviators, joining its military aviation in November 1914. From 18 May 1915 through March 1917, he would serve in Flieger-Abteilung 50, flying reconnaissance and bombing missions in Russia while winning both classes of the Iron Cross and being promoted to leutnant.