T12

T12 may refer to:

• T12 lamps are a kind of fluorescent light format
• T-12 antitank gun, a Russian weapon
• T-12 Cloudmaker, a super heavy demolition bomb
• T-12 sniper rifle, a Turkish weapon
• T-12 tank, a medium tank and prototype of the T-24
• Thoracic spinal nerve 12
• Trikke 12 Roadstar, a 3-wheeled cambering vehicle
• Telstar 12, a broadcast satellite
• T12, a  ¹²⁄₈-inch-diameter fluorescent lamp format
• T12, the bacteriophage responsible for scarlet fever
• Monzen-Nakachō Station of the Tokyo Metro (station number T-12/E-15)
• T12 (classification), visual impairment category for disability track and field athletics