Troop carrier is an informal or unofficial term for:

• an armoured personnel carrier or infantry fighting vehicle, whether tracked or wheeled
• a bus, especially an armored bus, used to carry military personnel
• any military transport aircraft, whether fixed-wing or helicopter
• any off-road vehicle with all-wheel drive and, usually, seating for six or more passengers, in addition to the driver
• in rail transport
  • a specific route, such as the Leamington Transit electric railway, in Canada, during World War I
  • a purpose-built rail car, such as a troop sleeper (US Army, World War II)
• a troopship or smaller vessel used to carry military personnel
  • Armored Troop Carrier, a riverine patrol vessel introduced by the US military in 1966