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.