NNK may refer to:
- NNK, one of the key tobacco-specific nitrosamines derived from nicotine
- nnk, the ISO 639-3 code for Nankina language
- Naknek Airport, the IATA code NNK
- Nemzeti Népegészségügyi Központ, a Hungarian centralised government health agency
See also
- NNK Rugby Stadium, a multi-use stadium in South Africa
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