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Dafni or Daphni (Greek Δάφνι before the spelling change, Dafnion Δάφνιον or Daphnion) is a monastery 11 km north-west of downtown Athens in Chaidari, south of Athinon Avenue (GR-8A). It is situated near the forest of the same name, on the Sacred Way that led to Eleusis. The forest covers about 15 to 20 km².

The Daphnion was founded about the turn of the 6th century, Christianizing the site of the Sanctuary of Apollo Daphnaios that had been desecrated by the Goths in 395, and reusing the Ionic columns of the ancient temple of Apollo in its portico; only one remains, the others having been removed to London by Lord Elgin.

Christ Pantocrator in a mosaic at Dafni, Greece

The principal basilica is a fine monument of the 11th-century Byzantine art. The church houses the best preserved complex of mosaics from the early Comnenan period (ca. 1100) when an austere and hieratic manner typical for the Macedonian epoch and represented by the famous Christ Pantocrator image inside the dome, was metamorphosing into a more intimate and delicate style, of which The Angel before St Joachim — with its pastoral backdrop, harmonious gestures and pensive lyricism — is considered a superb example.

According to the Encyclopaedia Britannica, "the ensemble represents a visualization of the Christian cosmos, its effect created by an intricately conceived interplay of pictures and architecture. Space in fact fuses the decoration into one giant image, in which the ruler, hailed by the prophets surrounding him, presides in his sphere above the host of saints that people the lower part of the room".

After the church was sacked by the Crusaders in 1205, Otho de la Roche, Duke of Athens, gave it to the Cistercian Abbey of Bellevaux. The French monks had the exonarthex reconstructed, built a wall around the monastery and effected numerous other changes until the Turks expelled them and restored the monastery to the Orthodox congregation in 1458. Gradually, the impoverished cloister fell into disrepair. The monastery was disbanded by Ottoman authorities in 1821 but restoration work did not commence until 1888. The patrimony was declared a World Heritage Site in 1990.