SDO may stand for:
Astronomy Scattered disc object in the Solar System Solar Dynamics Observatory, a NASA mission to study the Sun Subdwarf O star (sdO)
Computing, software, electronics Service Data Object protocol under the CANopen protocol Service Data Objects, allowing uniform data access Intel Secure Device Onboard for IoT Spatial Data Option, late Oracle Spatial and Graph Silent Death Online (videogame), from Mythic Entertainment
Groups, companies, organizations Standards developing organization San Diego Opera, California, USA Secret Double Octopus, Israeli software company SDO Bussum, Bussum, Netherlands; a Dutch association football club Air Santo Domingo (ICAO airline code SDO)
Other uses Sub Divisional Officer, in a district in India. Selective door operation on trains Social dominance orientation, a personality trait Bukar–Sadong language (ISO 639 language code sdo) Sistema Direzionale Orientale (Eastern Directional District), Rome, Italy; cancelled district served by Quintiliani station
See also