Harki (adjective from the Arabic harka, standard Arabic haraka حركة, "war party" or "movement", i.e., a group of volunteers, especially soldiers) is the generic term for Muslim Algerians loyalists who served as auxiliaries in the French Army during the Algerian War from 1954 to 1962. The phrase sometimes extends to cover all Algerian Muslims who supported the French presence in Algeria during this war. In France, the term is used to designate the Franco-musulmans rapatriés ("repatriated French Muslims") community living in the country since 1962, and its metropolitan born descendants. In this sense, the term Harki now refers to a distinct ethnocultural group, i.e. French Muslims, distinct from other French of Algerian origin or Algerians living in France. Today, the harkis and their descendants represent around 500,000 people in France.

On April 14, 2012, President Nicolas Sarkozy recognized France's "historical responsibility" in abandoning Harki Algerian veterans.

Algerian Muslim regular soldiers had served in large numbers with the French "Armée d'Afrique" (Army of Africa) from 1830 as spahis (cavalry) and tirailleurs (lit. skirmisher, i.e. infantry). They played an important part during the Franco-Prussian War of 1870 and World War I (1914–1918).