Emmanuelle Seigner (born 22 June 1966) is a French actress and singer. She is known for her roles in The Diving Bell and the Butterfly (2007), The Ninth Gate (1999) and Frantic (1988). She has been nominated for a César Award for Best Actress for Venus in Fur (2013), and for two César Awards for Best Supporting Actress in Place Vendôme (1998) and La Vie En Rose (2007). She has been married to Polish film director Roman Polanski since 1989.

Seigner is the daughter of Jean-Louis Seigner (1941-2020), photographer, and Aline Ponelle, journalist. She is the older sister of Mathilde Seigner, actress, and Marie-Amélie Seigner, singer. Through their father, they are the granddaughters of the actor Louis Seigner (1903-1991) and the nieces of the actress Françoise Seigner (1928-2008), both deans and members of the Comédie-Française. She is the niece of doctor Véronique Vasseur.