• Member Board of Directors or Board of Directors Member
• Minimal brain dysfunction or minimal brain damage, obsolete terms for attention-deficit hyperactivity disorder
• Metabolic Bone Disease
• "Thousand barrels per day," a measurement of production or consumption of crude oil
• Motherboard, a computer component.
• Murder by Death (band), an indie rock band.
• Man-Bites-Dog story, a slang term used in journalism
• Mordechai ben David, a Jewish singer
• My Brightest Diamond, chamber rock band of Shara Worden's
• Model Based Design, an approach to developing embedded control software in which models of software behavior serve as executable specifications, artifacts for analysis, test oracles, and sometimes the basis for automatic generation of source code.
• Microsoft Business Division, responsible for making Microsoft Office

MBd may refer to:

• Megabaud, equal to one million baud, symbol rate in telecommunications