Sister Stella L. is a 1984 Philippine political drama film directed by Mike de Leon from a screenplay he co-wrote with Pete Lacaba and Jose Almojuela, with additional dialogue written by Ellen Ongkeko. The screenplay was based on and inspired by the life and experiences of Sr. Chayong Battung and Sr. Mary Pilar Versoza, and it revolves around a nun becoming politically involved as she took part in a strike where she fought for the rights of the workers. It stars Vilma Santos as the titular nun of the film, Jay Ilagan, Gina Alajar, Laurice Guillen, and Tony Santos Sr.