S57

S57 may refer to:
 * S57 (Long Island bus)
 * S57 (New York City bus) serving Staten Island
 * HMAS Oxley (S 57), a submarine of the Royal Australian Navy
 * INS Sindhuraj (S57), a submarine of the Indian Navy
 * Prince Skyline (S57), a Japanese automobile
 * S57: Use appropriate containment to avoid environmental contamination, a safety phrase
 * Savoia-Marchetti S.57, an Italian flying boat
 * Sikorsky S-57, a planned experimental American aircraft
 * Siemens S57, a Siemens mobile phone