Lada Kaštelan (born 2 May 1961) is a Croatian dramatist and screenwriter.
Between 1987 and 2007, Kaštelan worked as a dramaturge at the Croatian National Theatre, Zagreb. Since 2007, she has been a professor at the Academy of Dramatic Art, University of Zagreb.
Kaštelan's screenplay for , co-written with Zrinko Ogresta, received the Golden Arena for Best Screenplay at the 1992 Pula Film Festival. Her play Giga i njezini received the 1995 Marin Držić Award.