Bletchley Park, in Milton Keynes, Buckinghamshire, was the central site of the United Kingdom's Government Code and Cypher School (GC&CS), which during the Second World War regularly penetrated the secret communications of the Axis Powersmost importantly the German Enigma and Lorenz ciphers.
Durante la seconda guerra mondiale, Bletchley Park fu il sito dell'unità principale di crittoanalisi del Regno Unito, nonché sede della Scuola governativa di codici e cifrazione ("Government Code and Cypher School (GC&CS)").