Johann Altfuldisch (born November 11, 1911, Brückenau, Germany — died May 28, 1947, Landsberg am Lech, Bavaria, Germany) was SS-Obersturmführer and a guard at Mauthausen-Gusen concentration camp where temporarily he was vice-chief of its central part. Altfuldisch was a member of the NSDAP and later on he joined the SS. In 1936 he began working at Sachsenhausen concentration camp. In 1938 he joined the Waffen-SS. Between 1938 and 1945 he held the second highest-ranking position at Mauthausen concentration camp, where he ordered and personally participated in many executions.