T43 may refer to:
Vehicles T-43 medium tank, a World War II Soviet medium tank T43 heavy tank, a pre-production model of the American M103 Heavy Tank T43-class minesweeper, a Soviet-designed minesweeper Boeing T-43, a 1973 United States Air Force military training and transport aircraft Cooper T43, a 1958 racing car SJ T43, a 1963 Swedish diesel-electric locomotive Slingsby T.43 Skylark 3, a British glider
Other uses T43 (classification), a disabled sports handicap class for leg amputees IBM ThinkPad T43, a laptop model