Phaistos (Greek: Φαιστός, pronounced [feˈstos]; Ancient Greek: Φαιστός, pronounced [pʰai̯stós], Linear B: 𐀞𐀂𐀵 Pa-i-to; Linear A: 𐘂𐘚𐘄 Pa-i-to), also transliterated as Phaestos, Festos and Latin Phaestus, is a Bronze Age archaeological site at modern Faistos, a municipality in south central Crete. It is notable for the remains of a Minoan palace and the surrounding town.

Ancient Phaistos was located about 5.6 km (3.5 mi) east of the Mediterranean Sea and 62 km (39 mi) south of Heraklion. Phaistos was one of the largest cities of Minoan Crete. The name Phaistos survives from ancient Greek references to a city on Crete of that name at or near the current ruins.

Phaistos was first inhabited around 3600 BCE, slightly later than other early sites such as Knossos. During the Early Minoan period, the site's hills were terraced and monumental buildings were constructed on them. Like other large Minoan cities, there was a palace that was built in an area that had been used earlier for communal feasting. The palace was built on a hill in the East and an acropolis was built on a hill in the West. The first palace was built in the Middle Minoan IB period, around 2000 BCE. The initial palace was destroyed and rebuilt three times in a period of about three centuries. The palace history is divided into three construction phases because of its reconstructions. The palace was destroyed around 1400 BCE and not rebuilt. This destruction may have been caused by a large earthquake.

Phaistos was interconnected to various other residences, most notably Hagia Triada and Gortyn. Hagia Triada has a smaller palace which may have been connected to the rulers of Phaistos as a vacation residence. Hagia Triada's port and relative closeness to Phaistos may have allowed for long distance trade and shared economic and political activity. Phaistos was one of the 3 largest cities of Minoan Crete along with Knossos and Malia. A road system connects the cities and the road from Phaistos to Knossos seems to the most prominent. This indicates that trade and transportation between the two cities was important, and that Phaistos was a valuable trade partner.

Several artifacts with Linear A inscriptions were excavated at this site. The name of the site also appears in partially deciphered Linear A texts and may be similar to Mycenaean 'PA-I-TO' as written on 62 Linear B tablets found at Knossos. Several kouloura structures (subsurface pits) have been found at Phaistos. Pottery has been recovered at Phaistos from in the Middle and Late Minoan periods. Bronze Age works from Phaistos include bridge spouted bowls, eggshell cups, tall jars and large pithoi. Grape pips have been found in storage vessels at Phaistos, indicating the production of wine.

The site was reinhabited during the Geometric Age (8th century BCE). Phaistos had its own currency, the stater. The city also created an alliance with other autonomous Cretan cities, and with the king of Pergamon Eumenes II.^{[citation needed]} Around the end of the 3rd century BCE, Phaistos was destroyed by the Gortynians and since then has not been present in the history of Crete. Scotia Aphrodite and goddess Leto, who was also called Phytia, were worshiped there. Epimenides, the wise man invited by the Athenians to clean the city after the Cylonian affair (Cyloneio agos) in the 6th century BCE, was a Cretan who may have descended from the people of Phaistos.

In 2025, the site was designated as a World Heritage Site by UNESCO.

Phaistos is home to one of the structures commonly known as a Minoan Palace. The structure of Minoan palaces differs from actual palaces and have been proven to serve more purposes, but the name has stuck. These structures are complex buildings that have multiple uses. The palace at Phaistos seemed to have religious and political purposes as well as sections for storage, housing, and a theater.