MRN
MRN stands for:
- Rhine-Neckar metropolitan region
- Master Reference Number Number that is assigned at the start of the ATLAS customs shipping declaration procedure, see New Computerized Transit System
- Mandate reference number of the SEPA direct debit scheme
- Foothills Regional Airport (IATA code), Morganton, North Carolina and Lenoir (North Carolina) , North Carolina airports
- Mouvement de la Réforme Nationale (Algerian Party)
mrn stands for:
- Cheke Holo (ISO-639-3 code), one of the oceanic languages found on Santa Isabel (island) , Solomon Islands