Holtun, Archaeological site in Petén Department, Guatemala.

Holtun is a Maya archaeological site 1.3 km south of La Máquina village in the municipality of Flores, Petén, Guatemala. About 115 structures lie along a north-south axis in six architectural groups, four on the hilltop and two at the foot of the slope. The karst bedrock holds numerous chultuns, underground storage chambers found in almost every group.

Holtun was occupied from the Middle Preclassic through the Late Classic; Mamon-horizon potsherds from looters' trenches and E-Group excavations point to Early Preclassic activity, and Chicanel ceramics mark the Late Preclassic triadic acropolis. In February 1994 the Instituto de Antropología e Historia was notified of looting at the then-unknown site, and its Department of Prehispanic and Colonial Monuments surveyed it that June and July. Brigitte Kovacevich and Michael Callaghan of Southern Methodist University began new investigations in 2010.

The name Holtun comes from Itza Maya and means "stone head"; it replaced the original name La Máquina, taken from the nearby village, when Agustín Estrada Monroy, then director of Guatemala's cultural heritage office, renamed the site. The large masks sculpted on the facade of a principal structure, exposed by looting, make Holtun the southernmost site in the Maya lowlands known to have such masks.

Holtun lies 1.3 km south of La Máquina village, in Flores municipality, on the road from Flores to Melchor de Mencos. The ruins sit on a hilltop 300 m above sea level, bordered on the south, east and west by three seasonal streams, so the ground is dry but broken. Access is on foot from the village; the surrounding land is deforested and farmed with maize, beans and plantain.

Holtun is the southernmost site in the Maya lowlands known to have large masks sculpted onto a principal structure; looters' trenches exposed them before archaeologists arrived. The site also holds chultuns, karst-cut storage chambers, in almost every architectural group.