Wajxaklajun, Archaeological site in San Mateo Ixtatán, Guatemala.

Wajxaklajun is an archaeological site in San Mateo Ixtatán situated on a ridge of the Cuchumatanes mountains at 2,540 meters elevation. The structures spread across three different levels and include platforms, pyramids, and several carved stone monuments.

The site was built during the Classic Maya period between 250 and 900 AD and served as a strategic point for salt trade between highland and lowland regions. This position made it an important junction for several trade routes.

The Chuj Maya consider Wajxaklajun a city built by their ancestors, and local tradition holds that the Chuj took the nearby salt springs from the Tojolabal in battle. The name means "eighteen" in Chuj, though it may instead come from a Maya calendrical name; a longer form, Chonjab' Tepan Wajxaklajun, translates as "town and temple eighteen". During the Spanish conquest the site received the Nahuatl name Ystapalapán, "place of salt".

The site lies directly beside the modern town of San Mateo Ixtatán and is reachable on foot from there. The elevation and mountain access require good footwear and some physical preparation.

Several carved stone monuments at this location suggest strong connections to lowland centers, which sets it apart from other highland Maya sites. These artworks show influences typically found only in more distant regions.