A Really Haunted Loud House is a 2023 American Halloween television film based on the Nickelodeon animated television series The Loud House and its live-action counterpart and spin-off series The Really Loud House. It is the second live-action work and third film in the overall franchise, following The Loud House Movie (2021) and A Loud House Christmas (2021). The film was directed by Jonathan Judge (co-executive producer and primary director of The Really Loud House) from a teleplay written by Tony Gama-Lobo, Rebecca May, and The Really Loud House developer and co-executive producer Tim Hobert, based on a story conceived by Gama-Lobo and May. Judge additionally serves as an executive producer of the film alongside Michael Rubiner, while Don Dunn and Melanie Kirk serve as producers. The film stars Wolfgang Schaeffer, Jahzir Bruno, Lexi DiBenedetto, Eva Carlton, Sophia Woodward, Catherine Ashmore Bradley, Annaka Fourneret, Aubin Bradley, Mia Allan, Ella Allan, Lexi Janicek, August Michael Peterson, Jolie Jenkins, and Brian Stepanek, reprising their roles from the live-action series, with Gavin Maddox Bergman, Trinity Jo-Li Bliss, Mateo Castel, Nolan Maddox, and Kevin Chamberlin in supporting roles. It was announced on April 4, 2023, alongside the second season of The Really Loud House and The Casagrandes Movie.

The film was originally planned to premiere on October 6, 2023 on Nickelodeon and Paramount+, but was later rescheduled to September 28, 2023. The events of the film take place between the first and second seasons of The Really Loud House.