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 Computing sdb (debugger) (Symbolic Debugger), Unix /dev/sdb, the second SCSI, SATA or USB disk