Jan van Katwijk
Jan van Katwijk is a retired Dutch cyclist who was active between 1965 and 1978. He won a number of races including Ronde van Drenthe, Acht van Chaam and national road championships as well as one stage of Vuelta a Andalucía and Tour de France. As an army serviceman he won the national military championships in 1967.
His son Alain, niece Nathalie, younger brothers Piet and Fons as well as son-in-law Bram Schmitz were also professional cyclists.
