Jaume Marquet i Cot (Catalan pronunciation: [ˈʒawmə məɾˈkɛt i kɔt]), more popularly known as Jimmy Jump (born 14 March 1976), is a streaker from Sabadell, Catalonia, Spain, known for interfering in several major entertainment and sporting events.

On 4 July 2004, during the UEFA Euro 2004 final between Greece and Portugal, Marquet threw an FC Barcelona flag at the Portuguese captain – Luís Figo – who left that team to join their archrivals, Real Madrid CF, in 2000.

At the final of the 2006-07 UEFA Champions League in Athens, Greece, between AC Milan and Liverpool FC, Jimmy Jump ran down the field with a Greek flag, but this was not shown by the television cameras.

In the 2004 Spanish Grand Prix, Jimmy ran through the starting grid during the formation lap, only to be apprehended by race marshals shortly after.

While he claimed to have many fans (due to his other performances at football matches), he was criticized for risking the lives of the drivers, even though the cars were travelling at low speed at this point.

During the 2009 Men's Singles Finals of the French Open, he accosted eventual winner Roger Federer, attempting to place a red barretina on his head.