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) (''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
{{disambiguation