S90 may refer to:
Automobiles Daihatsu Zebra (S90), a pickup truck and van Honda Sport 90, a motorcycle Toyota Crown (S90), a sedan Volvo S90, an executive car
Naval vessels , a submarine of the Royal Navy S90-class torpedo boat, of the Imperial German Navy , the lead boat of the class
Rail and transit S90 (Long Island bus) S90 (New York City bus) serving Staten Island S90 (TILO), a railway service in Switzerland
Other uses Canon PowerShot S90 a digital camera Series 90 (software platform), for mobile phones SIPA S.90, a French trainer aircraft Yamaha S90, a synthesizer