SDU
- NHS Sustainable Development Unit
- Sanda University
- Santos Dumont Airport
- Satellite Data Unit
- Sdu (publishing company)
- Service Data Unit
- Shandong University
- Single-family detached home
- Social Democratic Union (disambiguation)
- Social Development Unit
- Sodium diuranate
- Sonic Diver Unit
- Special Detective Unit
- Special Duties Unit
- State Disbursement Unit
- Suleyman Demirel University
- Surveillance Detection Unit
- Sweden Democratic Youth
- Süleyman Demirel University
- University of Southern Denmark