1991 FIA Formula One World Championship

The 1991 FIA Formula One World Championship was the 45th season of FIA Formula One motor racing. It featured the 1991 FIA Formula One World Championship, which commenced on 10 March 1991 and ended on 3 November after sixteen races. Ayrton Senna won his third and last Drivers' World Championship and McLaren-Honda won their fourth consecutive Constructors' Championship. Senna won seven of the sixteen races; his main challenger for the title was Nigel Mansell, who won five races in his first season back at Williams. Senna's fierce rival Alain Prost failed to win a race with Ferrari and was fired before the end of the season. 1991 also saw the debuts of future world champions Michael Schumacher and Mika Häkkinen.

The following teams and drivers competed in the 1991 FIA Formula One World Championship.

Three teams that started the 1990 season would not make the start of the 1991 season: EuroBrun had failed to complete the season. Onyx Grand Prix also pulled out during 1990, but went as far as designing a 1991 car before finally folding, while the absence of Life, a team that failed to prequalify for every race, surprised no-one.

The Osella team was now Fondmetal, though driver Olivier Grouillard was retained along with the 1989 Osella car and most of the staff.

The Arrows team was renamed Footwork after an investment by Japanese businessman Wataru Ohashi, President of Footwork Express Co., Ltd.

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