Erich Hüttenhain (26 January 1905 in Siegen – 1 December 1990 in Brühl) was a German academic mathematician and cryptographer and considered a leading cryptanalyst in the Third Reich.

[5] At OKW/Chi he was employed as a specialist to build a cryptanalytic research unit, and later he was most recently Executive Council Head of group IV Analytical cryptanalysis.

[10] He also created reports on the successes of the Germans on cryptographic territory during World War II (as deciphering the French naval codes, the Polish diplomat cipher and the security of the Enigma).

[14] In the first official cryptographic service of the Federal Government, the Unit 114 in the Foreign Ministry, headed by Adolf Paschke[15] founded in 1950, he was the chair of the Scientific Advisory Board, along with Kurt Selchow, Rudolf Schauffler, and Heinz Kuntze, some of the best cryptologists in Germany.

[12] During 1956–1970 he served as Deputy Director of the Central Office for Encryption where initially Wilhelm Göing and 1972 Otto Leiberich was his successor.