MB
- MB – (s) Manitoba (postal symbol) – Martinique (FIPS 10-4 territory code) - Medal of Bravery (Canada)
- MBA – (i) Main Battle Area – Main Belt Asteroid – Masters of Business Administration
- MBI = (i) Moody Bible Institute
- MBBL – (i) (U.S. Armor Center) Mounted Battlespace Battle Laboratory
- MBCC – (i) Migratory Bird Conservation Commission (U.S.)
- MBCS – (i) Multi-Byte Character Set
- MBE – (p) Member of the Order of the British Empire – (i) Multistate Bar Examination (U.S.)
- MBIDST – (i) Member of the British Institute of Dental and Surgical Technologists
- MBM – (i) Meat and Bone Meal
- mbsf – metres below sea floor, a depth convention used in paleontology and oceanography
- MBT – (i) Main Battle Tank
- MBTA – (i) Massachusetts Bay Transportation Authority – Migratory Bird Treaty Act (U.S.)
- MBTI – (i) Myers-Briggs Type Indicator
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