Joop Demmenie (19 December 1918 <unk> 3 June 1991) wuxuu ahaa baaskiil waddo oo ka yimid Nederland. Ka dib markii uu kaalinta afaraad ka galay tartanka waddada hiwaayadda ee 1937 UCI Road World Championships, wuxuu ku guuleystay bilada naxaasta ah 1938 UCI Road World Championships
tartanka waddooyinka hiwaayadda ragga. Waxa uu ahaa ciyaaryahan baaskiil xirfadeed intii u dhaxeysay 1939 iyo 1948. Sanadkii 1939 wuxuu ku guuleystay Brussel-Hozémont.