William Levett, Esq., (sometimes spelled William Levet) was a long serving courtier to King Charles I of England. Levett accompanied the King during his flight from Parliamentary forces, including his escape from Hampton Court palace, and eventually to his imprisonment in Carisbrooke Castle on the Isle of Wight, and finally to the scaffold on which he was executed. Following the King's death, Levett wrote a letter claiming that he had witnessed the King writing the so-called Eikon Basilike during his imprisonment, an allegation that produced a flurry of new claims about the disputed manuscript and flamed a growing movement to rehabilitate the image of the executed monarch.