The Lorenz beam blind landing system was an air radio navigation system in use from the latter 1930s. Prior to the World War II the Germans had deployed the Lorenz blind- landing aid at many airports and equipped most of their bombers with the radio equipment needed to use it. The name refers to the company that produced the system; Lorenz referred to it simply as the Ultrakurzwellen-Landefunkfeuer, German for "ultra-short-wave landing radio beacon", or LFF. Prior to the war the Lorenz equipment was installed for civil airports outside of Germany.

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