The GIGN (French: Groupe d'intervention de la Gendarmerie nationale pronunciation^ⓘ; transl. "National Gendarmerie Intervention Group") is the elite police tactical unit of the French National Gendarmerie. Among its missions are counterterrorism, hostage rescue, surveillance of national threats, protection of government officials, critical site protection (such as French embassies in war-torn countries), and targeting organized crime.

Established in 1973 and becoming operational in 1974, the GIGN was initially created as a relatively small tactical unit specialized in sensitive hostage situations, but has since grown into a larger force with expanded responsibilities and capabilities. It is now composed of nearly 1,000 operators: around 400 operators based in Satory, near Versailles in the Paris area and approximately 600 operators in fourteen regional GIGN branches called AGIGNs (French: Antennes du GIGN), located in metropolitan France or in the French overseas territories. The unit shares jurisdiction of French sovereign territory with the special response units of the National Police, and its training centre is located in Beynes.

Although most of its operations take place in France, the GIGN (as a component of the French Armed Forces) can operate anywhere in the world. Many of its missions are secret, and GIGN operators are not allowed to be publicly photographed. Since its formation, the GIGN has been involved in over 1,800 missions and has also rescued more than 600 hostages, making it one of the most experienced counter-terrorism units in the world.

In December 1994, the GIGN rose to worldwide prominence after its operatives successfully stormed Air France Flight 8969, which had been hijacked by the Armed Islamic Group of Algeria at Marseille Provence Airport; all four hijackers were killed in the assault.

GIGN was formed in Maisons-Alfort, near Paris, in 1973, shortly after the Munich massacre at the 1972 Summer Olympics and other less-known incidents in France exposed a need for dedicated counterterrorist units.

Initially named ECRI (French: Équipe commando régionale d’intervention, lit. 'Regional Commando Intervention Team'), it became operational in March 1974, under the command of then-lieutenant Christian Prouteau, and executed its first mission ten days later.

Another unit, named GIGN, was created simultaneously within the Mobile Gendarmerie parachute squadron in Mont-de-Marsan in southwest France, but the two units were merged under Prouteau's command in 1976, and adopted the GIGN designation.

GIGNs initial complement was 15, later increased to 32 in 1976, 78 by 1986, and 120 by 2005. GIGN moved to Versailles-Satory in 1982.