Well World is a series of science fiction novels by Jack L. Chalker. It involves a planet-sized supercomputer known as the Well of Souls that builds reality on top of an underlying one of greater complexity but smaller size. The computer was built by a now-extinct race, the Markovians, who developed the Well of Souls with the goal of creating a new species that would transcend their own.

Jack Laurence Chalker was an American science fiction author. Chalker was also a Baltimore City Schools history teacher in Maryland for 12 years, retiring during 1978 to write full-time. He also was a member of the Washington Science Fiction Association and was involved in the founding of the Baltimore Science Fiction Society.