The Lancia Stratos HF (Tipo 829), known as Lancia Stratos, is a rear mid-engined sports car designed for rallying, made by Italian car manufacturer Lancia. It was a highly successful rally car, winning the World Rally Championship in 1974, 1975 and 1976; and race car winning 1974 Targa Florio, five times the Tour de France Automobile and three editions of Giro d’Italia automobilistico.

Lancia traditionally used the design house Pininfarina and had not used Bertone before. Bertone desired to create an opportunity for a relationship with Lancia and knew that Lancia was looking for a replacement for the aging Fulvia for use in rally sports.

Bertone decided to design an eye-catching model to show to Lancia. Bertone used the running gear of a Fulvia Coupé which belonged to one of his friends and built a running model around it. When Bertone himself appeared at the Lancia factory gates with the Stratos Zero he passed underneath the barrier, to great applause from the Lancia workers.

Lancia and Bertone agreed to develop a new rally car based on the ideas of Bertone’s designer Marcello Gandini. Gandini had already designed the Lamborghini Miura and was working on the Countach at the time.

Lancia presented the Bertone-designed Lancia Stratos HF prototype at the 1971 Turin Motor Show, a year after the announcement of the Stratos Zero concept car. The prototype Stratos HF (Chassis 1240) was fluorescent red in colour and featured a distinctive crescent-shaped wrap-around windshield providing maximum forward visibility with almost no rear visibility. The prototype had three different engines in its early development life: the Lancia Fulvia engine, the Lancia Beta engine and finally, for the 1971 public launch, the mid-mounted Dino Ferrari V6 producing 190 hp (142 kW) in road trim.

The use of this engine had been planned from the beginning of the project, but Enzo Ferrari was reluctant to sign off the use of this engine in a car he saw as a competitor to his own Dino V6. After the production of the Dino had ended, the „Commendatore” (a popular nickname for Enzo Ferrari) agreed to deliver the engines for the Stratos, upon which Lancia suddenly received 500 units.

The car won the 1974, 1975 and 1976 championship titles in the hands of Sandro Munari and Björn Waldegård. 1975, 1976 and 1977 Monte Carlo Rally, all courtesy of Munari, the Stratos won the event with the private Chardonnet Team as late as 1979.