Reiner Joseph Karl August Stahel (15 January 1892 – 30 November 1955), also known as Rainer Stahel, was a German and Finnish military officer and a notable member of the Nazi Party. He is best known for his retreat from Vilna and the command of the garrison of Warsaw during the Warsaw Uprising of 1944. Arrested by the NKVD in Romania, he spent the rest of his life in Soviet Gulags.