Tres Islas is a small pre-Columbian Maya archaeological site located in the Petén Department of northern Guatemala. It is situated approximately 20 kilometres (12 mi) north of Cancuen.
The site dates back to the Late Preclassic and Late Classic periods of Mesoamerican chronology. Its primary architectural feature consists of a group of three Maya stelae and an altar, which are arranged to mimic an E-Group Maya astronomical complex.