TTF
- Custer Airport
- TESLA Test Facility
- TFF (disambiguation)
- Tanker Task Force
- Tax transparent fund
- Ten Thousand Fists
- Tetrathiafulvalene
- The Time Frequency
- Throw the Fight
- Thyroid transcription factor 1
- Timber Trade Federation
- Title Transfer Facility
- Titus the Fox
- Transcription termination factor, RNA polymerase I
- Trend type forecast
- TrueType
- Tumor treating fields
- Tunnel Trance Force
- Tuvalu Trust Fund