Luigi Sacco (1 August 1883 in Alba – 5 December 1970 in Rome) was an Italian general and cryptanalyst.

When Italy entered into World War I, he was a captain serving with radio-telegraphy troops. As specialist in direction finding he led the effort to locate and intercept Austro-Hungarian radiograms on the frontline, but due to a lack cryptanalysts they weren't being decrypted, so in 1916 he had to learn cryptanalysis himself. After the war he wrote books on cryptography.

Bibliography

Manual of Cryptology ("Manuale di Crittografia") (1936) ISBN 0-89412-016-6