Fabrique Nationale d'Herstal — self identified as FN Herstal and often referred to as Fabrique Nationale or simply FN — is a firearms manufacturer located in Herstal, Belgium.

FN is a subsidiary of the Belgian Herstal Group, which also owns U.S. Repeating Arms Company (Winchester) and Browning Arms Company. FN Herstal is the parent company of two United States entities: FN Manufacturing and FNH USA. FN Manufacturing, located in Columbia, South Carolina, is the manufacturing branch of FN Herstal in the United States, producing firearms such as the M249 and M240 machine guns and M16 rifle, among others. FNH USA, located in McLean, Virginia, is the sales and marketing branch of FN Herstal in the United States.

Firearms designed and/or manufactured by FN include the Browning Hi-Power pistol, Five-seven pistol, FAL rifle, FNC rifle, F2000 rifle, P90 submachine gun, M2 Browning machine gun, MAG machine gun, and Minimi machine gun—most of which have been very successful for the company. FN Herstal's firearms are used by the armed forces of over 100 countries.