T5 or T-5 can refer to:

• T5 engine
• T5 fluorescent lamp
• Borg-Warner T-5 transmission
• Ford T5, a Ford Mustang built for export to Germany
• Fuji T-5, a 1988 Japanese turboprop-driven primary trainer aircraft
• Tungsten T5, a PDA

and also :

• London Heathrow Terminal 5
• Tapestry 5, a Java-based Web application framework
• Fifth thoracic vertebrae
• Fifth spinal nerve
• Tele 5 (Poland), a TV channel
• Thunderbird 5, an episode in the Thunderbird TV series
• In topology, a completely normal and hausdorff space
• Trikke 5, a 3 wheeled cambering vehicle
• Volkswagen Transporter, a van
• Telecinco, a Spanish TV channel
• Turkmenistan Airlines, IATA airline designator
• the fifth Edition of the role-playing game Traveller
• Tekken 5, a fighting video game
• a model of the OS T1000 train of the Oslo Metro
• bacteriophage T5, a bacteriophage
• Taranaki 5