The A40 Devon (and similar 2-door A40 Dorset) are automobiles marketed by the Austin Motor Company from 1947 to 1952 – the first post-war saloons to be produced by Austin – featuring a mix of old and new technologies. They were previewed by the UK press at the Paris Motor Show on 22 October 1947, who expressed immediate disappointment at the car's conservative appearance. More than 450,000 were built before the model's replacement in 1952 by the Austin A40 Somerset.
Both the Devon and Dorset were body-on-frame designs with modern bodies and a 1.2 L straight-4 OHV engine producing 40 bhp (30 kW) at 4200 rpm. They featured front coil sprung independent suspension but retained a rigid axle and semi-elliptic leaf springs at the rear. The Girling brakes with 9 in (229 mm) drums were operated hydraulically at the front and mechanically at the rear. Later cars had column operated gear change and full hydraulic braking. A sliding sunroof and heater were extra cost options on the UK market.
The Devon was the 4-door version and was more successful than the 2-door Dorset, which was dropped in 1949 after only 15,939 were made.
The "Countryman" estate was produced up until 1956. A van and pickup truck were also produced.
A car tested by The Motor magazine in 1948 had a top speed of 70 mph (110 km/h) and could accelerate from 0–60 mph (97 km/h) in 37.2 seconds. A fuel consumption of 34.1 miles per imperial gallon (8.3 L/100 km; 28.4 mpg-US) was recorded. The test car, which had the optional sliding roof, cost £505 including taxes.