Benjamin Israel Murmelstein (9 June 1905 – 27 October 1989) was an Austrian rabbi. He was one of 17 community rabbis in Vienna in 1938 and the only one remaining in Vienna by late 1939. An important figure and board member of the Jewish group in Vienna during the early stages of the war, he was also an "Ältester" (council elder) of the Judenrat in the Theresienstadt concentration camp after 1943. He was the only "Judenältester" to survive the Holocaust and has been credited with saving the lives of thousands of Jews by assisting in their emigration, while also being accused of being a Nazi collaborator.