Lydia is a 1941 American drama film directed by Julien Duvivier and starring Merle Oberon as Lydia MacMillan, a woman whose life is seen from her spoiled, immature youth through bitter and resentful middle years, until at last she is old and accepting. The supporting cast features Joseph Cotten, Edna May Oliver and George Reeves. The picture is a remake of Duvivier's Un carnet de bal (1937), which starred Marie Bell as the leading character.

Julien Duvivier was a French film director and screenwriter. He was prominent in French cinema in the years 1930–1960. Amongst his most original films, chiefly notable are La Bandera, Pépé le Moko, Little World of Don Camillo, Panic (Panique), Deadlier Than the Male and Marianne de ma jeunesse.