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