SX
SX stands for:
- Nationality mark for aircraft from Greece
- Simplex , directed communication in communication technology; see duplex (communications engineering)
- Siemens PC-SX , a microcomputer from Siemens for industrial use in automation technology
- Skybus Airlines , former American airline (IATA code)
- SkyWork Airlines , Swiss airline (IATA code)
- St. Lucia Airways former airline (ICAO code)
- Supercross , variant of motocross in motorcycle racing
- Symphony X , American progressive metal band
- Order abbreviation for Xaverian missionaries
- Sint Maarten , as a country code according to ISO 3166-1
SX as a distinguishing mark on license plates: