MMN may refer to:
- Mismatch negativity
- Multifocal motor neuropathy
- Mystery meat navigation
- Matematikmaskinnämnden, the Swedish Board for Computing Machinery
- Mamanwa language, a Central Philippine language (ISO 639-3 code)
- Ticker symbol for Mannesmann AG, a German corporation
|This disambiguation page lists articles associated with the title MMN.
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