The Wolseley 4/50 was one of the Wolseley Motor Company's first post-war automobiles.
The cars were well equipped and looked impressive, with a round Morris rear end and upright Wolseley grille and were used extensively by the police at the time - the 6/80 particularly.
A 4/50 tested by the British magazine The Motor in 1950 had a top speed of 70.7 mph (113.8 km/h) and could accelerate from 0-60 mph (97 km/h) in 30.3 seconds. A fuel consumption of 27.0 miles per imperial gallon (10.5 L/100 km; 22.5 mpg-US) was recorded. The test car cost £703 including taxes.
Sales volumes were only a third those of the car's six-cylinder sibling: the car was regarded as heavy, with "good use of the excellent gear-box" being needed to maintain a respectable pace. The Wolseley 4/50 was more expensive than the Morris Oxford. The engine used was a 4-cylinder version of the 6/80. The pistons were just about the only common part used in this range of cars. aside from styling details around the nose, its body.