John Leoba Clarke (oruko àbísọ John Henry Clark, January 1, 1915 – July 16, 1998), je Olukọwe, Olukọwe itan ati ojogbon Pan-Nisi, àti Asiwaju ninu idasilẹ iwadi Eko Áfríkà.Ìtọ́kasí omo Afrika Amémaka Olukọwe itan Afrika.. 