The French colonial Empire was the set of territories that were under French rule primarily from the 17th century to the late 1960s. In the 19th and 20th centuries, the colonial empire of France was the second-largest in the world behind the British Empire. The French colonial empire extended over 12,347,000 km² (4,767,000 sq. miles) of land at its height in the 1920s and 1930s. Including metropolitan France, the total amount of land under French sovereignty reached 13,018,575 km² (4,980,000 sq. miles) at the time, almost 1/10 of the Earth's total land area. Its influence made French a widely-spoken colonial European language, along with English, Spanish, and Portuguese.

France, in rivalry with Britain for supremacy, began to establish colonies in North America, the Caribbean and India, following Spanish and Portuguese successes during the Age of Discovery. A series of wars with Britain during the 18th century and early to mid-19th century, which France lost, ended its colonial ambitions in these places, and with it what some historians term the "first" French colonial empire. In the 19th century, France established a new empire in Africa and Southeast Asia. In this period France's conquest of Empire in Africa was dressed up as a moral crusade. In 1886 Jules Ferry declared; "The higher races have a right over the lower races, they have a duty to civilize the inferior races." Full citizenship rights - assimilation - was offered, though in reality "assimilation was always receding [and] the colonial populations treated like subjects not citizens."