MDB may refer to:
Computing .mdb, a file-extension used in certain versions of Microsoft Access databases MDB, a kernel debugger for the Linux kernel. MDB, the NASDAQ ticker symbol for MongoDB, a database management system. Message Driven Bean, a special type of Enterprise JavaBean Modular Debugger, a debugger available as part of the Solaris Operating System Multidrop bus, a category of computer bus
Politics Member of the Bundestag (Mitglied des Deutschen Bundestages, MdB), a member of the German Parliament Brazilian Democratic Movement, a centrist political party in Brazil
Other uses Multilateral Development Bank Maidstone Barracks railway station, UK National Rail station code 3,4-methylenedioxybutanphenamine, an entactogenic drug Medulloblastoma, common type of primary brain cancer in children Mordechai Ben David, American Hassidic singer My Dying Bride, a British doom metal band
See also 1MDB, 1Malaysia Development Berhad, Malaysian strategic development company