La Joyanca is the modern name for a pre-Columbian Maya archaeological site located south of the San Pedro Martir river in the Petén department of Guatemala. It is east of the Maya site of La Florida (Namaan), now the modern town of El Naranjo on the Mexico-Guatemala border. The site was discovered in 1994 during the construction of the Xan-La Libertad oil pipeline in Guatemala. It was immediately recognized as an important, undiscovered Classic period (AD 200-900) Maya city and became the focus of an archaeological project. Directed by Charlotte Arnauld, Erik Ponciano, and Veronique Breuil, the La Joyanca project conducted excavations here between 1998 and 2003. Several members of this group have continued work at other related locations in the Northwest Peten, including the sites of Zapote Bobal and Pajaral, as part of the Proyecto Peten Noroccidente (PNO).

La Joyanca was occupied for well over 1000 years. Dates from the site range from the Late Preclassic (200 BC) to the Terminal Classic/Postclassic (AD 1000). Population levels reached their height here during the Late Classic (AD 600-900); during this era the rulers of La Joyanca embarked upon an ambitious building project in two areas, dubbed the Plaza Principal and the Grupo Guacamaya. The Grupo Guacamaya, a complex of vaulted rooms and corridors, may have served as their palace and thus the seat of local government. Following this prosperous era, the site, like most of its Classic period contemporaries, underwent a dramatic collapse. The Grupo Guacamaya was briefly occupied by squatters in the 10th century, but the area was ultimately abandoned by AD 1000.