Uaxactún, Archaeological site in Petén, Guatemala.

Uaxactún is a Maya archaeological site in Petén, Guatemala, 19 km north of Tikal. Its eight architectural groups (A–H) are split by a disused airstrip: groups A, B and C lie west, D, E and F east. Group E includes the Templo de los Mascarones, a stepped platform with stairways on four sides and sixteen human-feline masks, four per side.

Uaxactún was inhabited from about 900 BC until its abandonment around AD 900. In AD 378 it was conquered by Siyaj K'ak', a general linked to Teotihuacán, after which its kings claimed descent from him and the Tikal-Uaxactún polity dominated the Petén for some 180 years. Sylvanus Morley reached the overgrown site on 5 May 1916 during the Carnegie Institution's Second Expedition.

The temples and plazas show how the Maya applied their knowledge of sky movements directly into stone structures. These buildings served as places of worship and also functioned as tools for tracking the sun and stars throughout the year.

The site lies about 19 km north of Tikal; the road opened in the late 1970s and was much improved in 1984, and flights to the old airstrip were discontinued. The ruins are split by a disused landing strip, with Groups A, B and C west of it and D, E and F east. Sturdy footwear and water are needed.

The name comes from a stela where a date begins with the numeral eight, translating to 'Eight Stones' in the Maya language. Archaeologists gave the site this name after discovering and deciphering this particular inscription.