T3 or T-3 may refer to:
Entertainment T3: Alliance, an investigative-public affairs TV program in the Philippines T3 (magazine), focusing on new and hi-tech gadgets Terminator 3: Rise of the Machines, the third film in the Terminator series Tekken 3, a 1997 fighting game in the Tekken franchise Tiger 3, a 2023 Indian action thriller film in the YRF Spy Universe
Places Fletcher's Ice Island or T-3, an iceberg and scientific research station T3 (skyscraper), an office building in Taichung, Taiwan Tokyo Teleport Town, a planned city on Odaiba, reclaimed land in Tokyo Bay
Science, mathematics and technology T-3 tokamak, a record-breaking Soviet fusion experiment Axiom T3, or T3 space, regular space in topology and related fields of mathematics T3 Technion Technology Transfer, the technology transfer office of the Technion Israel Institute of Technology T3 line, or Digital Signal 3, a 44.736 Mbit/s telecommunications channel standard T-3, a Palomar–Leiden survey Jupiter Trojan subproject A tornado intensity rating on the TORRO scale
Devices SPARC T3, a CPU introduced by Sun Microsystems in 2010 Tungsten T3, a palmOne handheld device Talking tactile tablet, a touch sensitive device for visually impaired people Canon EOS Rebel T3, a digital camera T3, a Hospedia bedside television Sony Xperia T3, an Android smartphone
Medicine T3, in endocrinology, triiodothyronine, a thyroid hormone T3 spinal nerve Third thoracic vertebrae
An electrode site in the 10–20 EEG system T3, a tumor class in the TNM staging system
Transportation Eastern Airways (IATA code) Île-de-France tramway Line 3, in Paris T3 Bankstown Line, a former rail service in Sydney, Australia T3 Liverpool & Inner West Line, a rail service in Sydney, Australia T3 transit lane, a type of high-occupancy vehicle lane in Australia T3 road (Tanzania) T3 road (Zambia) T3 road (Jamaica) T3 (Tram İzmir), a tram line in Turkey Heathrow Terminal 3 Doomben line (numbered T3), a Queensland Rail service, Australia
Vehicles Fuji T-3, a Japanese primary military trainer aircraft LSWR T3 class, 4-4-0 steam locomotive NER Class T3, 0-8-0 steam locomotive T3, a model of the Oslo Metro OS T1000 train Tatra T3, a tramcar Trager-Bierens T-3 Alibi, a glider Volkswagen Type 2 (T3), the third generation of the Volkswagen Transporter van T3 tanker, a ship class T-3 Firefly, a former US Air Force training aircraft
Other uses T3, a halogen light bulb form factor T3 (company), a woman-owned advertising agency in the US T3 (rapper) (active beginning in 1996), founding member of the band Slum Village T3, a privatisation offering of the company Telstra T3 (roller coaster), at Kentucky Kingdom Tikka T3, a Finnish bolt-action rifle series T+3, "trade date plus three days" in financial markets
See also Polar T3 syndrome, low levels of that hormone in polar explorers 3T (disambiguation) TTT (disambiguation)