SMY or smy may refer to:
People edit
- Jimmy Smy (1907–1997), English football player
Places edit
- SMY, the IATA code of Simenti Airport, Senegal
- St Mary Cray railway station, London, National Rail station code
Other edit
- smy, the ISO 639 code of Semnani language
- SmY RNA, found in some nematode worms