|Full Name||William Cartwright|
|Family|| Ben Cartwright (uncle)|
|Children||Peggy Dayton (step-daughter)|
|First Episode||Return to Honor|
|Portrayed by||Guy Williams|
Will Cartwright was the nephew of Ben Cartwright. On receiving a telegram stating that Will had died, Ben went to retreive the body. Finding that Will was wounded, but alive, he was promptly taken to the Ponderosa. Will's past was basically unknown, except his for serving in the Mexican War. He stayed on the Ponderosa long enouh to marry Adam Cartwright's ex-fiance, Laura Dayton, before he left to start a new life somewhere else.