When Evil Lurks (Spanish: Cuando acecha la maldad) is a 2023 supernatural horror film written and directed by Demián Rugna. An international co-production of Argentina and the United States, the film stars Ezequiel Rodríguez, Demián Salomon, Luis Ziembrowski, Silvia Sabater and Marcelo Michinaux. When Evil Lurks premiered at the Toronto International Film Festival (TIFF) on September 16, 2023. It received a theatrical release by IFC Films on October 6, and debuted on the streaming service Shudder on October 27.