T12 may refer to:
Aerospace T12 (satellite), part of the DirecTV satellite fleet Slingsby T.12 Gull, a British glider Soyuz T-12, a crewed spaceflight Sukhoi T-12 Shturmovik-90, a proposed Russian fighter aircraft
Anatomy and medicine Bacteriophage T12, responsible for scarlet fever Thoracic spinal nerve 12 Twelfth thoracic vertebra
Automobiles Cooper T12, a racing car Dallara T12, a racing car Isotta Fraschini T12, a concept car
Rail and transit
Lines Île-de-France tramway Line 12 Express
Locomotives Prussian T 12, a steam locomotive DRGW Class T-12, an American 3ft steam locomotive; see Rio Grande 168
Stations Gokiso Station, Nagoya, Aichi Prefecture, Japan Higashi-Sapporo Station, Sapporo, Hokkaido, Japan Kyoto Shiyakusho-mae Station, Kyoto, Japan Monzen-Nakachō Station, Tokyo, Japan Moriguchi Station (Osaka), Japan Sambommatsu Station (Kagawa), Japan
Weapons and armor 100 mm anti-tank gun T-12, a Soviet anti-tank gun T-12 Cloudmaker, an earthquake bomb T-12 sniper rifle, a Turkish rifle T-12 tank, a Soviet prototype tank
Other uses T12 (classification), a disability sport classification Circular Head language Estonian national road 12 T12 road (Tanzania)
, a trawler of the Royal Navy T12 lamp, a fluorescent lamp format