Sister My Sister is a 1994 film starring British actresses Julie Walters, Joely Richardson, and Jodhi May. The film was directed by Nancy Meckler and written by Wendy Kesselman, based on her own play, My Sister in This House.

The film is based on a true incident in Le Mans, France, in 1933 called the Papin murder case, where two sisters brutally murdered their employer and her daughter. The murder shocked the country, and there was much speculation about the sisters, including allegations that they were having an incestuous lesbian affair.