SDO

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 )

Other uses

 * Sub Divisional Officer, a government officer in charge of a subdivision in a district in India.
 * Selective door operation on trains
 * Social dominance orientation, a personality trait
 * Bukar–Sadong language (ISO 639 language code )
 * Sistema Direzionale Orientale (Eastern Directional District), Via della Pietra Sanguigna, Rome, Italy; a cancelled-planned business district around Quintiliani subway station