The Fortune-teller (or Mrs. Fortune-teller) is a character in Harvest Moon. She lives in a wooden cabin north of the Livestock Dealer.
The Fortune-teller gives the player advice about romance. She herself does not talk to the player about it, but rather wrote a book about romance. This book is displayed on a table with a chrystal ball. If you read it, it contains information about raising bachelorette's heart levels.