Marie-Julie Baup (born on 13 September 1979, Paris) is a French actress, writer, and comedian. Her work includes roles in Micmacs onscreen and A Midsummer Night's Dream onstage, and she has received several nominations for various Molière Awards and won the award for Best Supporting Actress in 2013.

She is married to Lorànt Deutsch, whom she met while they were in a production of Amadeus in 2005. After growing up in Yvelines, Baup found her career of choice when cast in a school play, The Bald Soprano, at age 11. In 2005, she performed her first major role in a 2005 adaptation of Amadeus alongside Jean Piat and Lorànt Deutsch at the Théâtre de Paris; she and Deutsch were separately nominated for the Molière Award for Best Newcomer for their performances.