S71

S71 may refer to:

Submarines

 * INS Chakra (S71), of the Indian Navy
 * INS Tanin (S71), of the Israeli Navy
 * SPANISH SUBMARINE Galerna

Other uses

 * S71 (Long Island bus)
 * Blériot-SPAD S.71, a French biplane fighter
 * Savoia-Marchetti S.71, an Italian transport aircraft
 * S71, a postcode district for Barnsley, England