TN
- tn – (s) Tswana language (ISO 639-1 code)
- TN
- (s) Tennessee (postal symbol)
- Teranewton
- Tonga (FIPS 10-4 country code)
- Tunisia (ISO 3166 digram)
- TNA – (i) Total Nonstop Action Wrestling
- TND – (s) Tunisian dinar (ISO 4217 currency code)
- TNO – (i) Trans-Neptunian Object
- TNT
- (i) Thomas Nationwide Transport, an Australian company that was one of the predecessors to the former TNT N.V. and the current TNT Express
- (p) TriNitroToluene
- (a/i) Turner Network Television
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