MNN could refer to:
- Manhattan Neighborhood Network
- Master of Innovation and Technology (offered by Tecnológico de Monterrey and Babson College)
- Code of Menston railway station in the United Kingdom
- Minnesota Northern Railroad
- Musee National du Niger
- Maritime News Network, a radio news network owned by MBS.
- Mother Nature Network
- Multifocal motor neuropathy A medical condition where a person's muscles become weaker and cramped up.