TN3 or TN-3 may refer to:
- Tn3 transposon, a mobile genetic element found in prokaryotes
- Tennessee's 3rd congressional district
- Tennessee State Route 3
- Honda TNIII, a pickup truck
- TN3, a postcode district in Tunbridge Wells, England; see TN postcode area
See also edit
- The Tennessee Three (band), Johnny Cash's backing band
- Tennessee 3, legislators who faced the 2023 Tennessee House of Representatives expulsions
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