King's Quest III: To Heir Is Human is the third installment in the King's Quest series of graphic adventure games developed and released by Sierra On-Line in 1986. The game was originally released for the Apple II and PC DOS, and later ported to several other computer systems. It was the first title game in the series not to feature King Graham as the player character.

King's Quest III: To Heir Is Human is the third installment in the King's Quest series of graphic adventure games developed and released by Sierra On-Line in 1986. The game was originally released for the Apple II and PC DOS, and later ported to several other computer systems. It was the first title game in the series not to feature King Graham as the player character.