Marc GenÚ Guerrero (born May 29, 1974 in Sabadell, Catalonia, Spain) is a Spanish motor racing driver, best known as a tester for Williams and Ferrari in Formula One and a factory driver for Peugeot's Le Mans team.
GenÚ finished runner-up in the 1987 Catalan Kart Championship (National Class) at the age of 13; he would win both this and the National Class Spanish Kart Championship in 1988. In 1989 he competed in both the European and World championships. Gene won the Senior Class of the 1990 Spanish Kart Championship, making him the youngest driver to do so. He competed again in the World Championship in 1991, placing 13th.
For 1992 GenÚ moved into Formula Ford, placing 5th in the Spanish championship with a win and 2 pole positions. He was runner-up in the 1993 European Championship, with 1 win and 3 podiums; also, GenÚ took 2nd place at the Formula Ford Festival. In 1994, GenÚ was named Rookie of the Year in the British Formula Three Championship; he placed 10th in 1995. In 1996 GenÚ won the FISA Superformula championship, and in 1997 he competed in 5 rounds of the FIA Formula 3000 series, though he failed to score a single point. In 1998 he won the Open Fortuna by Nissan Championship.
GenÚ got his big break in 1999, occupying a race seat with the Minardi team. It was a difficult year; however, after several 9th places and an 8th, he managed to score his first point, and Minardi's first since 1995, with a 6th place at the European Grand Prix. He continued with Minardi in 2000, but failed to score a single point.
Unable to obtain a quality drive for 2001, GenÚ opted to sign with Williams as test driver. He has, however, driven some Grands Prix for Williams. The first of these was the 2003 Italian Grand Prix, where Ralf Schumacher was unable to race because of a concussion. GenÚ replaced his teammate well, collecting 4 points for a 5th place finish, but Schumacher was back in the car for the next race in the USA. Following a back injury to Schumacher at the 2004 USGP, GenÚ drove in the 2004 French and British Grands Prix, but subsequently lost the race seat to Ant˘nio Pizzonia and hasn't raced since.
In November 2004, GenÚ signed a deal to become a test driver for Scuderia Ferrari alongside former teammate Luca Badoer. His contract was renewed for 2007. A limit on testing in Formula One in 2007 and 2008 has limited his involvement.