Efthimis Filippou (Greek: Ευθύμης Φιλίππου) is an author, playwright, screenwriter, and journalist. His works for the stage have been presented at the Athens Epidaurus Festival, the Greek National Opera, the National Theatre of Greece, Onassis Stegi, and elsewhere in Greece and beyond. His works for the screen have been awarded at such film festivals as Cannes and Venice, and nominated at the Oscars.

He regularly collaborates with director Yorgos Lanthimos, with whom he has co-written the screenplays for several acclaimed films, including Dogtooth (2009), Alps (2011), The Lobster (2015), The Killing of a Sacred Deer (2017), and Kinds of Kindness (2024).