Joop Demmenie is a former road cyclist from Netherlands.
Career
He was a professional cyclist between 1939 and 1948.
Achievements
After he finished fourth in the amateur road race at the 1937 UCI Road World Championships, he won the bronze medal at the 1938 UCI Road World Championships in the men"s amateur road race. In 1939 he won Brussel-Hozémontana
