FIA Masters Historic Formula One Championship

The FIA Masters Historic Formula One Championship is a championship that has old Formula One cars from "the golden era", which caters for 3-litre engine Formula 1 cars, from 1966 to 1985.

The Historic Formula One Championship, previously known as the Thoroughbred Grand Prix Championship, was a championship for Formula One cars built during the 1960s, 1970s and 1980s. This championship was sanctioned by the Fédération Internationale de l'Automobile (FIA), the motor sport's world governing body. The championship was recognised by the FIA in 1994 as the only official FIA Historic Formula One Championship and its first season was in 1995. In 2013, the series was absorbed by Masters Racing to create the FIA Masters Historic Formula One Championship.

Masters Historic Racing is a United Kingdom based organisation, headed by entrepreneur Ron Maydon, which also operates a number of other historic race categories, including a sister American series open to the same cars as the FIA Masters Historic Formula One Championship.

The 2017 season was marred by the death of 61 year-old French driver David Ferrer at Zandvoort. Ferrer was driving a March 701.

The season schedule includes six circuits in 2023: Hockenheimring, Brands Hatch, Zandvoort, Silverstone, Spa-Francorchamps, and Algarve.

The championship was split into four classes according to the vehicle's age and technical specification.

The HFO Competition featured classic Grand Prix racing cars from the 20-year period between 1966 and 1985. During that period, there were design innovations and regulatory changes that resulted in significant performance differences and a vast speed differential between the earlier cars such as the Tyrrell 001, and the later machines such as the Tyrrell 012 and Brabham BT49.

Drivers score points within their particular car's class and all have the chance to claim the overall FIA trophy at the end of the season.