Jane Mallory Birkin, OBE (born 14 December 1946) is an English-French actress, singer, songwriter, and model. She attained international notoriety for her decade-long musical partnership with Serge Gainsbourg, and also had a prolific career as an actress in British and French cinema.

A native of London, Birkin began her career as an actress, appearing in minor roles in Michelangelo Antonioni's Blowup (1966), and Kaleidoscope (1966). In 1969, she met Serge Gainsbourg while co-starring with him in Slogan, which marked the beginning of a years-long working and personal relationship. The duo released their debut album Jane Birkin/Serge Gainsbourg (1969), and also appeared in the controversial film Je t'aime moi non plus (1973) under Gainsbourg's direction; her performance earned her a César Award nomination for Best Actress. Birkin would attain further acting credits in the Agatha Christie films Death on the Nile (1978) and Evil Under the Sun (1982).

After separating from Gainsbourg in 1980, Birkin continued to work as both an actress and a singer, appearing in various independent films and recording numerous solo albums. In 1991, she appeared in the miniseries Red Fox, and in the American drama A Soldier's Daughter Never Cries, in 1998. In 2016, she starred in the Academy Award-nominated short film La femme et le TGV, which she said would be her final film role.

Birkin has resided mainly in France since the 1970s. She is the mother of photographer Kate Barry (d. 2013), with her first husband John Barry; actress and singer Charlotte Gainsbourg, with Serge Gainsbourg; and model Lou Doillon, with Jacques Doillon. In addition to her acting and musical credits, she provided the namesake of the popular Hermès Birkin bag.