The Minardi M191 was a Formula One car designed by Aldo Costa and Rene Hilhorst and built by Minardi for the 1991 Formula One season. The car was powered by the Ferrari V12 engine and ran on Goodyear tyres. Its best finish in a race was 4th (twice).

For the 1991 season, team owner Giancarlo Minardi arranged a supply of Ferrari V12 engines to replace the Cosworth V8s that it had used since 1988.

The chassis was designed by Aldo Costa with Rene Hilhorst providing aerodynamic input.

The M191 debuted in the 1991 United States Grand Prix, driven by Italians Pierluigi Martini and Gianni Morbidelli. Martini, a longtime stalwart of Minardi, scored all the points scoring finishes for the team in 1991, finishing fourth at the San Marino Grand Prix and repeating the feat in Portugal. This meant a finish of 7th place in the Constructors' Championship, the best placing Minardi achieved in the course of its history.

Despite qualifying well on occasion (with a best of 8th place on the grid in San Marino and Japan), Morbidelli failed to score any points. His best finish was 7th at the Mexican race. He was promoted to the Ferrari race team following the sacking of Alain Prost after the Japanese Grand Prix.

Morbidelli was replaced by Brazilian Roberto Moreno for the last race of the year in Australia, at which he placed 16th.

The team used the M191 in a B-spec specification for the first four races of the 1992 season before it was replaced by the Minardi M192. With it, Morbidelli, back in the team after his one-off drive for Ferrari at the tail end of the previous season, finished 7th at the Brazilian Grand Prix. It was his only finished with the M191B. New recruit Christian Fittipaldi likewise only had one finish with the M191B, 11th at the Spanish race.

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