The Triumph TR3A was a sports car produced in the years 1955-1962. As a traditional roadster, the TR3 was a big improvement over the TR2 with more power and better braking capabilities. In total, around 74,800 units were sold in all variants. It was the third best-selling car of the TR range after the TR7 and TR6. They were sold with a 2-/2.2-liter I4 engine and 4-speed manual transmission.

The TR3A was an upgraded version and had a larger heat exchanger, it was also the first production car to have disc brakes in base. It was produced in 1957-1962 and as its name was not official, it was referred to as TR3. It had a power of 100 hp (75 kW), an average consumption of 10 l/100km and was able to accelerate from 0 to 100 km/h (62 mph) in about 12 seconds.