Cipher Bureau

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