Lager Sylt was a Nazi concentration camp on Alderney in the British Crown Dependency in the Channel Islands. Built in 1942, along with three other labour camps by the Organisation Todt, the control of Lager Sylt changed from March 1943 to June 1944 when it was run by the Schutzstaffel - SS-Baubrigade 1 and Lager Sylt became a subcamp of the Neuengamme concentration camp .

The Alderney camps were camps built and operated by Nazi Germany during its World War II occupation of the Channel Islands. Alderney island had four forced/slave labour sites, including Lager Sylt, the only Nazi concentration camp on British soil during the wartime occupation.