Huatusco (Nahuatl: Quauhtochco or Cuauhtochco) is an archaeological site located in the Carrillo Puerto municipality, near the small, almost deserted town of Santiago Huatusco, on the northern bank of the Rio Atoyac in the Rancho El Fortin. The importance of the site due to the nearly undamaged pyramid from prehispanic times, the largest part of the actual temple is still standing, in the state of Veracruz, Mexico.

The city was a Nahuatl speaking capital and probably an Aztec garrison developed by the name of Cuauhtochco in prehispanic times. Upon the conquest of Mexico, this garrison was defeated in November 1521, after the fall of Tenochtitlan by Gonzalo de Sandoval.

During the colonial period the area was of little interest due to the rapid depopulation, a small number of prehispanic religious buildings remain unnoticed and therefore unharmed. While the postclassical pyramid of Castillo de Teayo is well known and frequently visited, probably took visitors from this site to Huatusco, Veracruz. This may be due to site name confusion, because the place where this site is located, Santiago Huatusco, is about 70 km (43 mi) south-east from the city Huatusco also known as Hustusco de Chicuellar. In addition, access to the small settlement of Santiago Huatusco, where the site is located, is rather cumbersome.