Delia Ephron (/ˈɛfrən/ EF-rən;[4] born July 12, 1944) is an American writer and film producer.

Her movies include You've Got Mail, The Sisterhood of the Traveling Pants,[6] Hanging Up (based on her novel), and Michael.

She has written novels for adults (Hanging Up, The Lion Is In and the recent Siracusa) and teenagers (Frannie in Pieces and The Girl with the Mermaid Hair), books of humor (How to Eat Like a Child), and essays.

[8] Ephron collaborated with her elder sister, Nora, on Love, Loss, and What I Wore, which ran for over two and a half years Off-Broadway.

[9][10] In Fall 2024, Ephron made her Broadway debut as a solo playwright, with a stage adaptation of her autobiography, Left on Tenth, directed by Susan Stroman and starring Julianna Margulies and Peter Gallagher at the James Earl Jones Theatre[11] In 2014 she had written a New York Times op-ed reacting to a shocking plot twist on Julianna Margulies' TV drama The Good Wife.