S45

S45, S-45 or S.45 may refer to:

• S45 (Berlin), a public transportation route in Germany
• Vienna S-Bahn line, a public transportation route in Austria
• S45: In case of accident or if you feel unwell seek medical advice immediately (show the label where possible), a safety phrase in chemistry
• S45 postcode for North East Derbyshire
• Canon PowerShot S45, a digital camera model
• Short S.45, a Short Brothers aircraft
• Siemens S45, a 2001 cellular telephone model
• SABCA S-45bis, a Belgian aircraft
• S-45 (satellite), an American spacecraft
• USS S-45 (SS-156), a 1923 S-class submarine of the United States Navy
• Siletz Bay State Airport Federal Aviation Administration location identification code
• a Saviem bus model