Marcus Ulf Johan Grönholm

Marcus Ulf Johan Grönholm (Kauniainen, Finland, 5 February 1968) is a former Finnish rally driver. He joined the Peugeot 206 WRC programme in 1999 and in 2000 contested his first full season as a works driver for the manufacturer.

With Peugeot he became World Rally Champion in 2000 and 2002. Over his career he achieved 30 WRC victories, 61 podiums and more than 500 stage wins. In 2006 he joined the works Ford team in the Focus WRC and finished World Championship runner-up in both 2006 and 2007. He retired from regular competition at the end of 2007, although he later made several occasional appearances. His regular co-driver was Timo Rautiainen, who is also his brother-in-law.