Fabrique Nationale Herstal (French for 'National Factory Herstal'), trading as FN Herstal and often referred to as Fabrique Nationale or simply FN, is a leading firearms manufacturer based in Herstal, Belgium, and former vehicle manufacturer. It is currently the largest exporter of military small arms in Europe.

FN Herstal is owned by the Herstal Group holding company, which is in turn owned by the regional government of Wallonia. The Herstal Group also owns the Browning Arms Company and the U.S. Repeating Arms Company (Winchester).

FN America is the U.S. subsidiary of FN Herstal, which was formed by the merger of FN's previous two American subsidiaries – FN Manufacturing and FNH USA. A United Kingdom based manufacturing facility, FNH UK, is also in operation.

Firearms designed and/or manufactured by FN include the S.A.W. M249, Browning Hi-Power and Five-seven pistols, the FAL, FNC, F2000 and SCAR rifles, the P90 submachine gun, the M2 Browning, MAG, Minimi and the FN Evolys machine guns; all have been commercially successful. FN Herstal's firearms are used by the armed forces of over 100 countries.