A tirailleur (French: [tiʁajœʁ]), in the Napoleonic era, was a type of light infantry trained to skirmish ahead of the main columns. Later, the term "tirailleur" was used by the French Army as a designation for indigenous infantry recruited in the French colonial territories during the 19th and 20th centuries, or for metropolitan units serving in a light infantry role.

The French army currently maintains one tirailleur regiment, the 1st Tirailleur Regiment. This regiment was known as the 170th Infantry Regiment between 1964 and 1994. Prior to 1964, it was known as the 7th Algerian Tirailleur Regiment, but changed its name after it moved to France as a result of Algerian independence.

In the wars of the French Revolutionary and Napoleonic periods, the designation "tirailleur" was a French military term used at first to refer generically to light infantry skirmishers. The first regiments of Tirailleurs so called were part of the Imperial Guard of Napoleon I. By the fall of the Empire, some 16 regiments had been created. The Guard Tirailleurs were usually grouped as part of the Young Guard, along with their sister Voltigeur regiments.

The Guard Tirailleur regiments were disbanded during the reorganization of the French Army in 1814 by the new royal government. On 28 March 1815, during Napoleon I's short-lived return to power (the Hundred Days), Regiments 1-8 of the Guard Tirailleurs were officially re-raised. Only the 1st and 3rd Regiments actually took the field for the Waterloo campaign. All regiments of Imperial Guard Tirailleurs (along with the rest of the Guard) were disbanded following the Emperor's second abdication.

In addition to the regiments within the Imperial Guard, several foreign battalions of tirailleurs were raised, included the Italian Tirailleurs du Po and Corsican Tirailleurs Corses.

The first tirailleurs employed in French North Africa were a metropolitan light infantry unit — the 1er bataillon de tirailleurs de Vincennes which disembarked in Algiers in early 1840. This unit subsequently became the chasseurs d'Orléans but the title of tirailleurs was allocated the next year to newly raised regiments of indigenous Algerian infantry recruited from the Arab and Berber communities.

The tirailleurs from Algeria subsequently served in the Crimean War, the Second Italian War of Independence, the French intervention in Mexico and the Franco-Prussian War (1870), as well as in French colonial campaigns in Tunisia, Indochina, Morocco, Madagascar and Algeria itself. During the Crimean War the Algerian tirailleurs acquired the nickname of "Turcos" (Turks) by which they were widely known over the next hundred years. The name reportedly arose from comparisons between the Algerian troops and the Turkish allies serving alongside the French and British forces at the siege of Sevastopol.

First raised in 1841 as battalions of tirailleurs indigenes, the locally recruited Algerian infantry were organised into three regiments of Algerian Tirailleurs by a decree dated 10 October 1855. The number of such units fluctuated over the next hundred years until in the early 1960s eight regiments of tirailleurs plus a number of independent battalions remained in French service. Two battalions of Algerian Tirailleurs formed the bulk of the Détachement Français de Palestine et de Syrie that participated in the Sinai and Palestine Campaign from 1917 onwards.