MRB
MRB is the abbreviation for:
- IATA code of the civil and military airfields Eastern WV Regional Airport or Shepherd Field , near Martinsburg (West Virginia) (USA)
- Human Rights Advisory Board, an independent Austrian body to control the detention of people by the executive
- Central German Regiobahn, a brand of the Transdev Regio Ost
- MittelrheinBahn, a brand of trans regio
- Mouvement Régionaliste de Bretagne , a regional organization in Bretagne, which aims at the "political emancipation" of the region within the framework of the EU
- Motor lifeboat