The Hagia Triada Sarcophagus is a late Minoan 137 cm (54 in)-long limestone sarcophagus, dated to around 1400 BC or some decades later, excavated from a chamber tomb at Hagia Triada, Crete in 1903 and now on display at the Heraklion Archaeological Museum (AMH) in Crete, Greece.

Uniquely for such a piece from this date on Crete, it is coated in plaster and painted in fresco on all faces. Unlike the ancient Egyptians, the Minoans only used frescoes to decorate palaces and houses for the enjoyment of the living, not for funerary use. It is the only limestone sarcophagus of its era discovered to date; there are a number of smaller terracotta "ash-chests" (larnax), painted far more crudely, usually in a single colour. It is the only object with a series of narrative scenes of Minoan funerary ritual (later sarcophagi found in the Aegean were decorated with abstract designs and patterns). It was probably originally used for the burial of a prince.

It provides probably the most comprehensive iconography of a pre-Homeric thysiastikis ceremony and one of the best pieces of information on noble burial customs when Crete was under Mycenaean rule, combining features of Minoan and Mycenaean style and subject matter, as well as probable influence from Ancient Egyptian religion.

The Hagia Triada Sarcophagus was discovered on June 23, 1903 by Roberto Paribeni on a hilltop containing a late Bronze Age cemetery near the site of Hagia Triada. This funerary structure, referred to as tomb 4, is located near two tholos tombs (A and B) dating from the Prepalatial period, close to a larnax burial area, and close to another tomb from the Neopalatial or Postpalatial period.

The sarcophagus was discovered in a burial chamber, or rather a small structure that served as a tomb, measuring 3.8 × 4.2 m (9.8 ft × 13 ft). The walls of the structure, which were preserved at a height ranging from 65 cm (25 in) to 1.20 m (3.2 ft), stop at ground level and thus have no proper foundation. This structure, with its thick walls made of small irregular stones, is the only example of this type in the entire Minoan and Mycenaean world. The walls show no traces of frescoes. The first excavations did not reveal traces of a roof, but the stones of the structure suggest that they could have served as a base for a wooden structure, perhaps similar to the building depicted on the sarcophagus itself. Contemporary with the Mycenaean presence in Crete, the building combines traditional elements of Minoan architecture with Mycenaean forms. Tomb 4 is similar to two Mycenaean tombs found at Farsala, in northern Greece. A similar tomb, closer and dating from the same period, was discovered at Archanes. Like tombs A and B from Mycenae, the tombs at Hagia Triada and Archanes were reserved for a closed social group.

All four faces of the sarcophagus are fully painted in several colours, using the fresco technique otherwise only found in Minoan paintings on walls, and sometimes floors and ceilings. Each of the long sides has a long section with a narrative figure scene of a religious ritual. One of the short end sides has a roughly square section with a scene of a chariot with two figures, presumably goddesses as they are pulled by a griffin (possibly two), above which hovers a large bird. The other end has two scenes, the upper almost entirely missing, but probably with a procession of male figures. The lower scene again has two figures in a chariot pulled by two horses.

These scenes are surrounded by ornamental borders covering the remaining areas. These are comparable to the decorative borders around Minoan wall-paintings, although larger in relation to the figures. The ornament includes scrolls, stripes, and rows of rosettes. Immediately above and below the narrative scenes on the long sides are thin blank (white) strips, into which some elements of the scenes intrude at the top. On the sides the strips are a mixture of colours.

Unlike larnakes, the sarcophagus has no lid, and none was apparently intended. It also has drainage holes.