- Management Information Base , a computing information repository used (for example) by Simple Network Management Protocol
- An abbreviation for Mebibyte ( MiB ) or Mebibit (Mib)
- Men In Black , a group of mysterious agents in Conspiracy Theory
- '' The Men In Black '' a short-lived comic series from Malibu Comics focusing on a group of these agents
- '' Men In Black '', an action/comedy movie, and its sequel '' Men In Black II '' based on the comic series
- Man In Black , an alleged "super spy" who made reported assassination attempts on Saddam Hussein and has no sure affiliation with a government
- Medical Information Bureau , a Credit Agency for life insurers.
- Meiringen-Innertkirchen Bahn , a railway company in Switzerland
- Melayu Islam Beraja , Malay Islamic Monarchy present in Brunei Darussalam
- Milano Italia Borsa, as used in ''MIB 30'' - the main Stock Market Index of the Borsa Italiana .
- Motor Insurers Bureau , a function of the British government which deals with compensation claims from victims of uninsured and untraced drivers.
- 2-methyl Isoborneol , a musty-smelling odorant sometimes found in Drinking Water and Cork Taint .
- Master Of International Business . Also a suffix on the name of those who have achieved the degree (sometimes as M.I.B.).
- Manchester Interdisciplinary Biocentre , a Research Institute within the University Of Manchester .
- Mouvement Immigration Banlieues , a French NGO .
- In Marbles , any marble, but esp. a 5/8" regulation-sized target marble. Also a target in a marble game.
- Knoppix-MiB is a version of the Knoppix Linux distribution which focuses on security issues.
- Mint In Box, a collector's abbreviation for an item in Mint Condition
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