Citroën (French pronunciation: [si.tʁɔ.ˈɛn]) is a major French automobile manufacturer, part of the PSA Peugeot Citroën group.

Founded in 1919 by French industrialist André-Gustave Citroën (1878–1935), Citroën was the first mass-production car company outside the USA and pioneered the modern concept of creating a sales and services network that complements the motor car. Within eight years Citroën had become Europe's largest car manufacturer and the 4th largest in the world.

Citroën earned a reputation for innovation and revolutionary engineering, which is reflected in the company's slogan "Créative Technologie". Its history of innovation began with its founding, when André-Gustave Citroën introduced the first industrial mass production of vehicles outside the United States, a technique he developed mass-producing armaments for the French military in World War I. In 1924, Citroën produced Europe’s first all-steel-bodied car, the B-10. In 1934, Citroën secured its reputation for innovation with its Traction Avant, not only the world's first mass-produced front-wheel drive car, but also one of the first cars to feature a monocoque-type body. In 1954 Citroën produced the world's first hydropneumatic self-levelling suspension system,^{[citation needed]} then in 1955 the revolutionary Citroën DS, the first European production car with disc brakes.^{[citation needed]} In 1967, Citroën introduced the first swiveling headlights in several models, allowing for greater visibility on winding roads.