"You got Renado's letter! It carefully details how to treat Ilia to get her memory back."
— In-game description

Renado's Letter is a quest item from The Legend of Zelda: Twilight Princess. The letter is given to Link by Renado after Link defeats Armogohma in the Temple of Time. The note explains how to get Ilia's memory back, and Renado asks Link to bring it to Telma because he does not want to see her personally. When Link gives the letter to Telma, it convinces her to give Link an invoice for Doctor Borville.