The Peugeot 403 is a car produced by French automobile manufacturer Peugeot from 1955 to 1966.
The 403 debuted in saloon body style on 20 April 1955 at the Trocadéro Palace in Paris. The engine size gave the car a fiscal horspower of 8 CV (8 hp) which placed it a class below the soon to be replaced 11 CV Citroën Traction, but at least one class above the small cars produced by the principal competitor manufacturers.
When it was first shown, and through until after 1958, the leading edge of car's nose carried an angular, forward-leaning chrome lion hood ornament, the lion image being Peugeot's trade mark — which was removed in 1959 due to safety concerns, the logo incorporated into a shield-shaped grill emblem.
Subsequently the semaphore-style trafficators on the C-pillars were replaced with flashing indicators within the light cluster. The front lights were modified to conform to new standards and parallel-parking windscreen wipers were substituted for the original "not quite parallel" ones featured at launch.
In the television detective series Columbo, the main character drove a 1959 convertible model 403. Peugeot ran an advertising campaign that described Columbo as the most famous driver of the car.
Superseded by the Peugeot 404 in 1960, the 403 remained in production as a budget alternative until 1966.