Cipher Bureau may refer to:
- Cipher Bureau (United States), aka Black Chamber (1919–1929), the US government's first peacetime cryptanalytic organization
- Cipher Bureau (Poland) (Biuro Szyfrów), the interwar Polish unit charged with signals intelligence, cryptography and cryptanalysis that broke the German cipher machine Enigma
- Cipher Bureau (film), a 1938 American film
This disambiguation page lists articles associated with the title Cipher Bureau.
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