Herbert Floss or Herbert Floß was an SS functionary of Nazi Germany who served as acting commander of the Sobibor extermination camp during the Holocaust in Poland. He also served as cremation expert in Camp II Totenlager at the Treblinka extermination camp.
Floss joined the NSDAP in 1930, the SA in 1931, and the SS in 1935. He served at Sobibor from its establishment in April 1942 until the uprising on 14 October 1943. Before entering service in Sobibor, Floss was stationed in Buchenwald and several euthanasia centres. In the early period of Sobibor, Floss was the acting commander for a few weeks until he was succeeded by Gustav Wagner. Before the victims went into the gas chambers, he took their last possessions from them.
Floss as remembered by fellow Treblinka SS officer Heinrich Matthes: "Floss arrived at this time [November 1942], who, so I presume, must previously have been in another camp. He then had the installation built for burning the corpses. The incineration was carried out by placing railroad rails on blocks of concrete. The corpses were then piled up on these rails. Brush wood was placed under the rails. The wood was drenched with gasoline.