Annette Vadim (born Annette Strøyberg, 7 December 1936 - 12 December 2005) was a Danish actress who was the second wife of the French film director Roger Vadim. Her films included Vadim's Les Liaisons Dangereuses (1959).
Annette Strøyberg was born on 7 December 1936 on Funen Island in Denmark. In 1958, at the age of 21, she played in the film Les bijoutiers du clair de lune by Roger Vadim with Gérard Philipe and Jeanne Moreau. During this production, she and Roger Vadim, who had just divorced Brigitte Bardot in December 1957, fell in love and married on 17 June 1958. They had a daughter, Nathalie Vadim, who was born in Denmark and herself became an actress. They divorced in 1960 after the lack of critical success for Les Liaisons Dangereuses.
Annette died of cancer in Copenhagen, Denmark, on 12 December 2005.