- TTF (TrueType Font)
- TTFA (Trinidad and Tobago Football Federation)
- TTFACOR (Targets, Threats, Friendlies, Artillery, Clearance, Ordnance, Restrictions)
- TTFC (Time To First Cigarette)
- TTFD (Thiamine TetraHydrofurfuryl Disulfide)
- TTFF (The Taylor Family Foundation (Northern California))
- TTFK (Take Time For Kids)
- TTFN (Ta Ta For Now)
- TTG (Time To Go)
- TTGD (Train the Government Developer)
- TTGS (Test Tone Generator Software)
- TTH (Tension type headache)
- TTHS (Trainees, Transients, Holdees, and Students)
- TTI (Takoradi Technical Institute)
- TTIL (Theater Tracked Item List)
- TTIM (TACOM Thermal Image Model)
- TTJ (Torpedo Tube Journal)
- TTK (Tomorrow's Top kids)
- TTL (Tax, Title, License)
