Ludivine Sagnier (birthdate is 3 July 1979) is a French actress and model, who has worked in 33 movies since 1989. She was nominated for two César Awards for Best Supporting Actress in Swimming Pool and Un secret.
Sagnier has appeared completely nude in extended scenes in several films, including Water Drops on Burning Rocks, Bon plan (both released in 2000), and La Petite Lili. In the Francois Ozon's English film Swimming Pool, Sagnier worked topless for more than half of her appearances. Addressing this issue, Sagnier told Playboy: "I'm much more confident in front of a camera, hidden by a character, enhanced by makeup, so I can go much further than I can in real life. Sexual acting is painful, because even though you're pretending, you have the skin of the person in front of you, and it's not the skin you wish you had. After that, you run into the shower to get rid of everything". She also starred in P. J. Hogan's 2003 adaptation of Peter Pan, as Tinkerbell.
In 2005, she recorded a series of introductions for Sky Movies. These included intros to several films.
On 25 March 2005 she gave birth to a daughter named Bonnie. The father is actor Nicolas Duvauchelle.