Patrick Sercu (born 27 June 1944) is a retired Belgian cyclist who was active on the road and track between 1961 and 1983. On track, he won the gold medal in the 1 km time trial at the 1964 Summer Olympics, as well as three world titles in the sprint, in 1963, 1967 and 1969. On the road, he earned the green jersey in the 1974 Tour de France. Sercu is the record holder for the number of six-day track race victories, having won 88 events out of 223 starts between 1961 and 1983; several of these wins were with cycling great Eddy Merckx. He also won six stages at the Tour de France and eleven stages at the Giro d’Italia.