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
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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