KALTIPETLAHTOL (House of the Mountain Language) is an ITML research field station in the Sierra Norte region of the state of Puebla, Mexico, dedicated to language technology, documentation, and revitalisation of the Nahuatl languages spoken in the region. Located in the municipal seat of Tetela de Ocampo, a contact zone for two prominent Nahuatl varieties in the region (Western Sierra Puebla Nahuatl [nhi] and Highland Puebla Nahuat [azz]), the field station provides an office setting for native speakers and researchers working on local projects related to Nahuatl and language technology.

Current projects being carried out via the field station include the transcription of over 10 hours of oral texts and dialogues from speakers of Western Sierra Puebla Nahuatl, and the translation of the Florentine Codex, a historically significant colonial Nahuatl text, into contemporary Nahuatl variants.

Amenities at Kaltipetlahtol (also written Kaltepetajtol to reflect both of the major Nahuatl variants in the area) include desks, whiteboards, and a growing library of Nahuatl dictionaries, grammars, literature, and anthropological texts. The field station is managed by Robert Pugh, a second-year PhD student in CL, and currently employs native speakers from the Western Sierra variant from the nearby town of Omitlán as transcribers and translators.