The 1966 to 1970 Lancia Fulvia Coupe HF Series I was a performance version of the Fulvia Coupe Series I. Various trims were produced, including the Coupe HF, Rallye 1.3 HF, Rallye 1.6 HF, and Rallye 1.6 HF works. The coupe body style featured larger headlights, aluminum body panels, fender flares, Plexiglas windows, as well as removed bumpers. The interior lacked amenities as it was a competition-focused vehicle. Suspension components received revised geometry and negative front camber. 1.2L, 1.3L, and 1.6L V4 engines with performance carburetors were fitted over the course of production, with power sent to the front wheels via a five-speed manual transmission. The Fulvia HF was cosmetically and mechanically updated in 1970 as the Lancia Fulvia Coupe HF Series II.