SDX or sdx may refer to:
SDX, the IATA code for Sedona Airport, Arizona, United States SDX, the station code for Sidki railway station, Pakistan sdx, the ISO 639-3 code for Sibu Melanau language, Malaysia and Brunei Sadako DX, a 2022 Japanese supernatural comedy film Serdexmethylphenidate, prodrug of dexmethylphenidate