| Acronym | Definition |
|---|
| MB | Mercedes-Benz |
| MB | Megabyte |
| MB | Master Bedroom |
| MB | Megabit |
| MB | Media Bureau (Federal Communications Commission) |
| MB | Molecular Biology |
| MB | Maybe |
| MB | Motherboard |
| MB | Mainboard (UK) |
| MB | Modified By |
| MB | Message Board |
| MB | Miami Beach (Florida) |
| MB | Manitoba, Canada |
| MB | Main Battery |
| MB | Myrtle Beach |
| MB | Management Board |
| MB | Managed Backup (remote computer file backup) |
| MB | Martinique |
| MB | Muy Bien |
| MB | Manila Bulletin |
| MB | Mario Brothers (game) |
| MB | Merit Badge (Boy Scouts of America) |
| MB | Memory Backup (SONET) |
| MB | Manhattan Beach |
| MB | Moody Blues (band) |
| MB | Mennonite Brethren |
| MB | Milton Bradley |
| MB | MacBeth |
| MB | Michelle Branch |
| MB | Military Base |
| MB | Monza e Della Brianza (Italian province) |
| MB | Motorbike |
| MB | Marine Biology (various schools) |
| MB | MacBook |
| MB | Matchbox |
| MB | Marching Band |
| MB | Mavis Beacon (typing tutor program) |
| MB | Message Back |
| MB | My Bad |
| MB | Mindless Behavior |
| MB | Memory Buffer |
| MB | Meccanica Breganzese (bucket crusher manufacturer; Italy) |
| MB | Mortgage Broker (various companies) |
| MB | Mass-Balance |
| MB | Myoglobin |
| MB | Methyl Bromide (fumigant) |
| MB | Motorboat |
| MB | Mythbusters |
| MB | Muslim Brotherhood |
| MB | Marginal Benefit |
| MB | Mel Brooks (director) |
| MB | Mean Bias |
| MB | Middle Button (computer mouse) |
| MB | MusicBrainz (open source music-database) |
| MB | Ministerieel Besluit (Dutch: Ministerial Deree; Belgium) |
| MB | Minimum Bid (auctions) |
| MB | Moscow Bound (Vietnam POWs) |
| MB | Millibar |
| MB | Monster Box |
| MB | Multibanco (Portugal) |
| MB | Main Base |
| MB | Mixed Breed |
| MB | Mystery Block |
| MB | Muppet Babies (cartoon) |
| MB | Manic Bloom (band) |
| MB | Malibu Beach |
| MB | Macro Block |
| MB | Mikrobitti (Finnish computer magazine) |
| MB | Manufacturing Base |
| MB | Machine Batch |
| MB | Military Budget |
| MB | Medicine Bow (Camp Yawgoog, BSA) |
| MB | Main Beam |
| MB | Manufacturers Bank (California) |
| MB | Marine Base |
| MB | Multi-Ball (pinball) |
| MB | Monmouth Beach (New Jersey) |
| MB | Military Bank |
| MB | Medicine Box |
| MB | Multibacillary (leprosy) |
| MB | Milan Baros (soccer player) |
| MB | Magnetic Bearing |
| MB | Mike Bibby (NBA Player) |
| MB | Mixed Bed |
| MB | Moon Bounce (ham radio) |
| MB | Maintenance Branch |
| MB | Marine Barracks |
| MB | Melt-Banana (band) |
| MB | Monthly Balance |
| MB | Message Blocking |
| MB | Message Broadcasting (Tandem) |
| MB | Maintenance Burden |
| MB | Marker Beacon |
| MB | Medium Bomber |
| MB | Milton Bradley Company |
| MB | Military Brat |
| MB | Make Buy |
| MB | Mechanized Brigade |
| MB | Mesiobuccal (tooth anatomy) |
| MB | Marine Battalion |
| MB | Machinery Breakdown (insurance) |
| MB | Magic Burst (Final Fantasy XI gaming) |
| MB | Maintain Benefits |
| MB | Masterblasters (gaming clan) |
| MB | Manaburn (Everquest skill) |
| MB | Medicinae Baccalaureus (Bachelor of Medicine) |
| MB | Manned Base |
| MB | Measured Business |
| MB | Measurement Base |
| MB | Mossbauer Spectrometer (NASA) |
| MB | Missile Battalion |
| MB | Metric Buttload |
| MB | Middle Babylonian |
| MB | Michel Beroff (classical pianist) |
| MB | Manaetic Behemoth (gaming) |
| MB | Mineralolie Brancheforeningen |
| MB | Mana Break (gaming) |
| MB | Moon Bandit (computer game) |
| MB | Military Battalion |
| MB | Mechanical Breaking |
| MB | Ministerstvo Bezopasnosti (Russian Security Ministry) |
| MB | Melli Bank PLC |
| MB | Missile Bomber |
| MB | Magazijnbeheerder (Dutch) |
| MB | Willys-Overland 1/4-Ton 4x4 Truck (WWII Jeep) |
| MB | Municipal Bank PLC |
| MB | Musquodoboit Batholith |
| MB | Machine Basin |
| MB | Mission Baptiste (French) |
| MB | Multistage Bayesian |
| MB | Mixed-Resin Bed (anion & cation) |
| MB | Mario's Bakery |