Leutnant Hermann Pfeiffer was a World War I flying ace credited with eleven aerial victories.Pfeiffer joined the German army on 1 October 1913. He rose to Unteroffizier in the 114th Bavarian Infantry Regiment. He won an Iron Cross Second Class in May 1915. He then transferred to aviation, and in July, he began pilot training. Once qualified, he was posted to FFA 10, where he was promoted to Vizefeldwebel on 11 July 1916.