T15 or T-15 may refer to:

Aerospace T15 (satellite), a DirecTV communications satellite Marlin Airport, Texas, United States Slingsby T.15 Gull III, a British glider Soyuz T-15, a crewed spaceflight

Automobiles Chery T15, a Chinese concept car Cooper T15, a British Formula Three racing car: see Cooper Mk.V Simca-Gordini T15, a French racing car Triumph T15 Terrier, a motorcycle

Railway stations Minami-Sunamachi Station, Tokyo, Japan Nangō-Jūsan-Chōme Station, Sapporo, Hokkaido, Japan Nijō Station (Kyoto), Japan Sanuki-Tsuda Station, Kagawa, Japan Sekime-Takadono Station, Osaka, Japan Yagoto Station, Nagoya, Aichi, Japan

Weapons and armour Safir T-15, a rifle Škoda T-15, a prototype German-Czechoslovak light tank T-15 torpedo, a Soviet nuclear torpedo T-15 Armata, a Russian infantry fighting vehicle Vickers T-15 light tank, of the Belgian Army

Other uses T-15 (reactor), a Russian tokamak fusion research reactor Estonian national road 15 T15 road (Tanzania)

Little Swanport language