MRB

MRB could refer to:


 * Eastern WV Regional Airport, Martinsburg, West Virginia, United States; IATA airport code
 * Maidenhead Railway Bridge
 * Malaysian Rubber Board
 * Manorbier railway station, Wales; National Rail station code MRB
 * Maribo railway station, Denmark (code Mrb)
 * Mariënberg railway station, Mariënberg, the Netherlands (code Mrb)
 * Marijuana-related businesses, business activities that are related to marijuana and might be sanctioned in some countries
 * Marina Bay MRT station, Singapore; station abbreviation MRB
 * Martinsburg (Amtrak station), West Virginia, United States; Amtrak station code MRB
 * Metallica Resources; New York Stock Exchange symbol MRB
 * Michael Reilly Burke
 * Mobile Riverine Base, see Mobile Riverine Force
 * Mortgage revenue bond loan
 * MrBookmaker.com cycling team, see Cycle Collstrop
 * MRB constant
 * MRB Productions
 * Murrumbeena railway station, Melbourne, Australia; station code MRB
 * Mullamangalath Raman Bhattathiripad, Malayali social reformer and writer
 * Mother Russia Bleeds, a 2016 video game
 * Modified reflected binary code, a code similar to a Gray code