The Benetton B186 was built and raced by the Benetton team for the 1986 Formula One World Championship. It was the first car to be constructed and raced by Benetton, which had bought the Toleman team at the end of 1985 after several years of sponsoring it and other teams, including Alfa Romeo and Tyrrell.

The B186 was a competitive car: in the hands of drivers Gerhard Berger and Teo Fabi, it set two pole positions, three fastest laps, and was victorious at the 1986 Mexican Grand Prix.

The B186, along with the Brabham BT55, Arrows A9 and other BMW-engined cars in 1986 are the most powerful Grand Prix cars ever built. The B186 in particular, being the most competitive of the BMW engined cars that season could produce 1,350+ hp in qualifying trim, and about 900 hp in race trim.