Cipher Bureau may refer to:
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Cipher Bureau (United States), aka Black Chamber (1919–1929), the US government's first peacetime cryptanalytic organization
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Cipher Bureau (Poland)
The Cipher Bureau, in Polish: ''Biuro Szyfrów'' (), was the interwar Polish General Staff's Second Department's unit charged with SIGINT and both cryptography (the ''use'' of ciphers and codes) and cryptanalysis (the ''study'' of ciphers and co ...
(''Biuro Szyfrów''), the interwar Polish unit charged with signals intelligence, cryptography and cryptanalysis that broke the German cipher machine Enigma
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''Cipher Bureau'' (film), a 1938 American film
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