SDO
- Air Santo Domingo
- Bukar–Sadong language
- Enhanced privacy ID
- List of districts in India
- Mythic Entertainment
- Quintiliani
- SDO Bussum
- San Diego Opera
- Scattered disc
- Secret Double Octopus
- Selective door operation
- Service Data Object protocol
- Service Data Objects
- Social dominance orientation
- Solar Dynamics Observatory
- Spatial Data Option
- Standards developing organization
- Sub-divisional magistrate
- Subdwarf O star