Tom Boonen (Dutch pronunciation: [ˈtɔm ˈboːnə(n)]; born 15 October 1980) is a Belgian professional road bicycle racer who won the 2005 world road race championship. He is a member of the Quick-Step Floors team, and is a single-day road specialist with a strong finishing sprint. He won the cycling monuments Paris–Roubaix 4 times and the Tour of Flanders 3 times, among many other prestigious victories, such as prevailing 5 times in the E3 Harelbeke, winning 6 stages of the Tour de France and winning the Overall title of the Tour of Qatar 4 times.
At the start of 2002 Boonen rode for U.S. Postal Service, finishing third in Paris–Roubaix after an early breakaway. Fellow Belgian Johan Museeuw had escaped to a solo victory. Team captain George Hincapie crashed in a slippery section of the course leaving Boonen to ride for himself. Boonen's performance led Museeuw – his childhood hero – to declare Boonen his successor.
Boonen said US Postal did not give him enough chances to ride for himself. Towards the end of the year he said he would leave, despite being under contract, and joined Quick-Step–Davitamon at the start of 2003. The 2003 season, however, did not go well, with lacklustre performance due to fatigue and knee injury. Museeuw was team leader for the spring classics.