MRN may refer to: Material Recipt Note
- Magnetic resonance neurography, a medical imaging technique
- Migrants Rights Network, a London based non-governmental organisation
- Mister Rogers' Neighborhood, an American children's television series
- Motor Racing Network, the principal radio broadcasting operation of auto racing organization NASCAR
- Mre11-Rad50-Nbs1, a protein complex involved in DNA repair in mammals
- Foothills Regional Airport (was Morganton-Lenoir Airport), IATA airport code