- 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)
