The Fiat X1/9 is a two-seater mid-engined sports car designed by Bertone and manufactured by Fiat from 1972–1982 and subsequently by Gruppo Bertone from 1982–1989.

With a transverse engine and gearbox in a mid-mounted, rear-wheel drive configuration, the X1/9 was noted for its balanced handling, retractable headlights, lightweight removable hardtop which could be stowed under the bonnet, front and rear storage compartments — and for being the first Fiat to have been designed from its conception to meet US safety regulations.