SDB
SDB or sdb may refer to:
- Subdwarf B star (SdB)
 
Organizations
    
- Salesians of Don Bosco, a Roman Catholic religious order
 - Seventh Day Baptist, a Christian denomination
 - Social Democratic League (Sociaal Democratische Bond), a Dutch socialist political party
 - Society for Developmental Biology
 - State Security Administration, Yugoslav secret police
 - State Security Service, Serbian secret police
 - Surat Diamond Bourse, India
 
Military
    
- SDB (Strategicheskiy Dahl'niy Bombardirovshchik – strategic long-range bomber), Myasishchev M-4
 - GBU-39 Small Diameter Bomb or GBU-53/B, guided bomb
 - Service Dress Blue (SDB), a uniform of the United States Navy
 - Seaward Defence Boat
 
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