Ludivine Sagnier is a French actress. She was nominated three times for the César Award for Best Supporting Actress for Swimming Pool (2003), Peter Pan (2003), and A Secret (2007).

Swimming Pool is a 2003 erotic thriller film co-written and directed by François Ozon and starring Charlotte Rampling and Ludivine Sagnier. The plot focuses on a British crime novelist, Sarah Morton, who travels to her publisher's upmarket summer house in Southern France to seek solitude in order to work on her next book. However, the arrival of Julie, who claims to be the publisher's daughter, induces complications and a subsequent crime. Both lead characters are bilingual, and the film's dialogue is a mixture of French and English.