The Sunbeam-Talbot 90 is an automobile which was produced and built by Sunbeam-Talbot from 1948 to 1954 and continued as the Sunbeam Mk III from 1954 to 1957.

The 90 was launched in 1948 along with the smaller-engined Sunbeam-Talbot 80 but many features dated back to the pre war Sunbeam-Talbot 2 Litre. The body, available as a 4-door 4-light sports saloon or 2-door drophead coupe, appeared completely new though it continued some major pressings. The saloon featured the original Aero-Minx "pillarless" join between the glass on the rear door and the rear quarter window with its distinctive Sunbeam-Talbot reverse slope.

This car went through three versions before the name was changed to Sunbeam Mk III (without "Talbot") in 1954.

The Sunbeam-Talbot 90 MkIIA was the last car to bear the Sunbeam-Talbot name.

Announced at the beginning of July 1948 this new car by then had been on display in New York, Boston and Toronto. The 1,944 cc four-cylinder engine was redesigned from the preceding Sunbeam-Talbot 2 Litre and still fundamentally the design of the 1937 Hillman 14 now badged Humber Hawk. Now the engine had been given a new cast-iron cylinder head holding overhead valves, the pushrods rising through the old valve guides. Output could now reach 64 bhp (48 kW) at 4100 rpm. The sports saloon weighs 26.25 cwt (2,940 lb; 1,334 kg) The chassis with beam axles and semi-elliptic leaf springs all round was scarcely changed from the same 2 Litre model but provided a wider track. The old basic Lockheed brakes were updated to hydraulic operation. The inevitable post war steering column gear-change proved one of the better versions of this new fad. Close-coupled sports saloon and drophead coupé bodies were fitted to the chassis and the rear wheel openings were covered by metal "spats".

The Times reported the 90 was fast, being capable of reaching 80 mph (130 km/h), (it was independently timed at 76.6 mph (123.3 km/h)), it was well-sprung and there was no wind-roar when cruising at 60 mph (97 km/h) to 70 mph (110 km/h). The intermediate gears were remarkably quiet. The steering column gear lever was light to operate but it required several tries to engage reverse. The springing was not up to the standard provided by the independent front suspension. The sports saloon on test leaked into the interior in several places. The tester liked the variable driving position, the seat height can also be adjusted. "This is one of the prettiest cars made today anywhere."

4,000 were made from 1948 until 1950.

For September 1950 and the Earls Court Motor Show the engine was enlarged to 2267 cc by increasing the bore ¼ inch from 75 mm to 81 mm. The increased engine block capacity was shared with the company's 1950 Humber Hawk but the Humber retained (until 1954) the old side-valve arrangement. The 90 engine now developed 70 bhp (52 kW), and could pull a higher rear axle ratio for more comfortable cruising. The new engine output compared with only 58 bhp (43 kW) for the Humber. The favourable power-to-weight ratio meant that the Talbot could be "geared quite high" and still provide impressive acceleration where needed for "quick overtaking".