The Triumph 2000 was a mid-sized automobile produced by the Triumph Motor Company between 1963 and 1977. The 'Mark I' was built between 1963 and 1969; a substantial facelift styled by Michelotti came in 1969, updating the car for the 1970s. It came in saloon and estate forms.

A 2.5 litre fuel-injected model of the Mark I, the 2.5 PI, was launched in 1968, but gained a reputation for unreliability. Because of the launch late in the Mark I's life, there are relatively few PIs in the original shape.

In 1969, the Mark II range was launched, aping the look of the then-upcoming Triumph Stag grand tourer. There were entry-level 2000 models, which were the most plentiful, but the remainder of the range consisted of 2500, 2500 twin-cam (TC) and 2500 PI models. Late in its life a 2500S model, with 14 inch (356 mm) wheels and anti-roll bar, was added.

The Mark II, the last big Triumph car, ceased production in 1977, supplanted by BL's corporate executive car, the Rover SD1. A few were still being registered in New Zealand as late as 1979, and many were still on the road in the 1990s. Sir Robert Muldoon, New Zealand's then-Prime Minister, privately owned a 2500S and had been known to drive to work in it.