The national flag of France (French: drapeau français) is a tricolour flag featuring three vertical bands coloured blue (hoist side), white, and red. It is known to English speakers as the Tricolour, (French: Tricolore), although the flag of Ireland and others are also so known. The design was adopted after the French Revolution; while not the first tricolour, it became one of the most influential flags in history. The tricolour scheme was later adopted by many other nations in Europe and elsewhere, and, according to the Encyclopædia Britannica has historically stood "in symbolic opposition to the autocratic and clericalist royal standards of the past".

Before the tricolour was adopted the royal government used many flags, the best known being a blue shield and gold fleur-de-lis (the Royal Arms of France) on a white background, or state flag. Early in the French Revolution, the Paris militia, which played a prominent role in the storming of the Bastille, wore a cockade of blue and red, the city's traditional colours. According to French general Gilbert du Motier, Marquis de Lafayette, white was the "ancient French colour" and was added to the militia cockade to form a tricolour, or national, cockade of France.

This cockade became part of the uniform of the National Guard, which succeeded the militia and was commanded by Lafayette. The colours and design of the cockade are the basis of the Tricolour flag, adopted in 1790, originally with the red nearest to the flagpole and the blue farthest from it. A modified design by Jacques-Louis David was adopted in 1794. The royal white flag was used during the Bourbon Restoration from 1815 to 1830; the tricolour was brought back after the July Revolution and has been used since then, except for an interruption for a few days in 1848. Since 1976, there have been two versions of the flag in varying levels of use by the state: the original (identifiable by its use of navy blue) and one with a lighter shade of blue. Since 2021, France has used the older variant by default, including at the Élysée Palace.