Willy Hack (26 March 1912 – 26 July 1952) was a German SS officer and concentration camp official. He was born in the town of Reutlingen, Baden-Württemberg, and trained as an engineer before joining the Schutzstaffel (SS) in 1934. Following the outbreak of World War II, Hack served in the Waffen-SS on the Eastern Front. In February 1942 he was promoted to the rank of Obersturmführer and transferred to Amtsgruppe C (Buildings and Works) at the SS-Main Economic and Administrative Office in Berlin.