Hermann Langbein (18 May 1912 - 24 October 1995) was an Austrian who fought in the Spanish Civil War with the International Brigades for the Spanish Republicans against the Nationalists under Francisco Franco. He was interned in France after the end of the Spanish Civil War, and then sent to German concentration camps after the fall of France in 1940.
Over the next few years he was imprisoned in several different camps (Dachau, Auschwitz and others). He was among the leadership of the International Resistance groups in the camps he was held in. After 1945 he was General Secretary of the International Auschwitz Committee, and later Secretary of the "Comite' Internationale des Camps".
Hermann Langbein was among those awarded the Righteous Among the Nations status by Yad Vashem.
He wrote several books about his experiences in the camps.