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).

Minardi was an Italian automobile racing team and constructor founded in Faenza in 1979 by Giancarlo Minardi. It competed in the Formula One World Championship from 1985 until 2005 with little success, nevertheless acquiring a loyal following of fans. In 2001, to save the team from folding, Minardi sold it to Australian businessman Paul Stoddart, who ran the team for five years before selling it on to Red Bull GmbH in 2005 who renamed it Scuderia Toro Rosso. Initially called "M" then a number, from 2001, all of Minardi chassis were called "PS", the PS being the initials of team owner, Paul Stoddart.