SDO may stand for:
Science and technology
- Scattered disc object in the Solar System
- Selective door operation on trains
- Service Data Object protocol under the CANopen protocol
- Service Data Objects, allowing uniform data access
- Social dominance orientation, a personality trait
- Solar Dynamics Observatory, a NASA mission to study the Sun
- Spatial Data Option, late Oracle Spatial and Graph
- Standards developing organization
- Subdwarf O star (sdO)
- Intel Secure Device Onboard for IoT
Government
- Sub Divisional Officer, an officer in charge of a subdivision in a district in India.
Other uses
- San Diego Opera, California, US
- SDO Bussum, a Dutch association football club
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