The Lancia Stratos HF (Tipo 829), widely and more simply known as Lancia Stratos, is a sports car and rally car made by Italian car manufacturer Lancia. The HF stands for High Fidelity. It was a very successful rally car, winning the World Rally Championship in 1974, 1975 and 1976.

A Bertone-designed concept car called the Lancia Stratos Zero was shown to the public in 1970, but shares little but the name and mid-engined layout with the Stratos HF version. A new car called the New Stratos was announced in 2010 which was heavily influenced by the design of the original Stratos, but was based on a Ferrari chassis and engine.