Films with screenplays by Lamberto E. Antonio

Insiang () is a 1976 Philippine drama film directed by Lino Brocka. Its screenplay, written by Mario O'Hara and Lamberto E. Antonio, is based on O'Hara's teleplay of the same name. Set in the slums of Tondo, Manila, the film stars Hilda Koronel as the eponymous character: the young daughter of a resentful mother (Mona Lisa), whose much-younger lover (Ruel Vernal) rapes her. After her assault and the betrayal of her own lover (Rez Cortez), Insiang seeks revenge. A representation of urban poverty, the film explores themes of betrayal, revenge and despair.