Jan Derksen (23 January 1919 – 22 May 2011) was a Dutch professional cyclist. He was world professional track sprint champion in 1946 and 1957. He was the only rider to win a gold medal at Milan, Italy, in 1939 – in the world amateur sprint – before the championship was abandoned at the outbreak of the Second World War. Derksen became a riders' agent and race promoter after retiring from racing and lived in a house on the outskirts of Amsterdam, named after the Ordrup track in Denmark where he won the professional omnium – akin to a pentathlon in athletics – 10 times.