The Fiat G.91 was an Italian jet fighter aircraft. It was the winner of the NATO competition in 1953 for a light fighter as standard equipment for Allied air forces. It entered in operational service with the Italian Air Force in 1961, with the West German Luftwaffe, in 1962,[and later with the Portuguese Air Force.
It was in production for 19 years. 756 aircraft were completed, including the prototypes and pre-production models. The assembly lines were finally closed in 1977. The Fiat G.91 enjoyed a long service life that extended over 35 years. It was widely used by Portugal in the Portuguese Colonial War in Africa.