Minsa'y Isang Gamu-gamo (English: Once a Moth) is a 1976 Filipino protest drama film directed by Lupita Aquino-Kashiwahara with a story and screenplay by Marina Feleo-Gonzales. It stars Nora Aunor, Jay Ilagan, Gloria Sevilla, and Perla Bautista. Set near Clark Air Base in Pampanga, the film depicts the lives of two families affected by the American military presence in the Philippines. It was the first important film to address the subject of the American military presence in the Philippines during the Bases era. The film ultimately argues for the closure of these facilities.