Johannes Jacobus Posthumus (24 Gunyana 1887 muGouda <unk> 12 Zvita 1978 muUtrecht) aive mutambi wechiDutch uyo akakwikwidza mumitambo yeOlympic yezhizha ya1908. Aiva nhengo yechikwata cheNetherlands chemajimnastics, icho chakapedza chiri chechinomwe mumutambo wechikwata
. Mumakwikwi evanhu vose akapedza ari wechi66.