Hanna Olivia Marin is a fictional character created by Sara Shepard for the Pretty Little Liars book series, and later developed for the Freeform television series adaptation by I. Marlene King. The character has also appeared in the spin-off series Ravenswood.

Sara Shepard is an American author. She is known for the bestselling Pretty Little Liars and The Lying Game book series, both of which have been turned into television shows on Freeform.