A high powered lawyer. William Clark had expected his daughter to follow in his footsteps and take over his practice. Much to William's disappointment, Martha fell for a farmer from Smallville. Feeling she deserved better, William told so to Jonathan, who responded by punching him. As a result, William became largely uninvolved with his daughter's life and family.
In 2002, William traveled to Smallville, to give the Kents financial help with their farm. William's adoptive grandson, Clark, tried to get him and Jonathan to reconcile, but failed.
- William Clark was portrayed by George Coe.
- In "Finale, Part I", an elderly couple can be seen seated next to Martha at the church. Presumably, they are supposed to be William and his wife.
- 2 Appearances of William Clark (Smallville)
- 1 Images featuring William Clark (Smallville)
- Quotations by or about William Clark (Smallville)
- Character Gallery: William Clark (Smallville)