S 56

S56 may refer to:

Aircraft

* Blériot-SPAD S.56, a family of prototype French airliners
* Savoia-Marchetti S.56, an Italian flying boat
* Sikorsky S-56, an American helicopter
* Sukhoi S-56, a proposed Russian carrier fighter

Other uses

* S56 (Long Island bus)
* S56 (New York City bus) serving Staten Island
* County Route S56 (Bergen County, New Jersey)
* Explorer S-56 (satellite), a failed American spacecraft
* GER Class S56, a British steam locomotive
* , a submarine of the Indian Navy
* Prince Skyline (S56), a Japanese automobile
* S56: Dispose of this material and its container at hazardous or special waste collection point, a safety phrase
*
* Siemens S56, a Siemens mobile phone

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