S45 may refer to:
Aviation
edit- Blériot-SPAD S.45, a French biplane airliner
- SABCA S-45bis, a Belgian bomber
- Short S.45, a British biplane trainer
- Short S.45 Seaford, a British flying boat
- Sikorsky S-45, a proposed American flying boat
- Siletz Bay State Airport, in Lincoln County, Oregon, United States
Rail and transit
edit- S45 (Berlin), a line of the Berlin S-Bahn
- S45 (Long Island bus)
- S45 (Vienna), a line of the Vienna S-Bahn
Other uses
edit- Canon PowerShot S45, a digital camera
- Explorer S-45 (satellite), a failed American spacecraft
- S45: In case of accident or if you feel unwell seek medical advice immediately (show the label where possible), a safety phrase
- INS Shankush (S45), a submarine of the Indian Navy
- Siemens S45, a mobile phone
- Sulfur-45, an isotope of sulfur
- USS S-45 (SS-156), a submarine of the United States Navy
- S45, a postcode district in Chesterfield, England
- Saviem S45, a Savien bus model