Mixco Viejo (/ˈmisko ˈβieχo/) ("Old Mixco"), occasionally spelt Mixcu Viejo, is an archaeological site in the north east of the Chimaltenango department of Guatemala, some 50 kilometres (31 mi) to the north of Guatemala City and 4 kilometres (2.5 mi) from the junction of the rivers Pixcaya and Motagua. It is a moderate sized ruined city of the Postclassic Maya civilization.