Filip Müller (3 January 1922 – 9 November 2013) was a Jewish Slovak Holocaust survivor and a member of the Sonderkommando at Auschwitz, the largest Nazi German concentration camp during World War II, where he witnessed the murders of tens of thousands of people.

Once the crematoria were completed, Müller was assigned to a Sonderkommando unit tasked with operating the killing facilities; his performing this role, he believed, was the only reason the Germans kept him alive.

After the victims had been murdered, Müller's unit was tasked with the removal of the bodies and grouping them by size and fatty tissue to facilitate their disposal in the crematoria.

Eventually, Müller decided to end his life by joining a group of the first liquidation of Theresienstadt family camp inside the gas chambers.

His statement was originally published in an obscure Czech collection, but it was reprinted in the 1966 book The Death Factory, written by two other Holocaust survivors, Erich Kulka and Ota Kraus.

The Monowitz Subcamp, seven kilometres (4.3 mi) from the main Auschwitz site, was a labor camp run by the German firm IG Farben, and there were no crematoria there.