The Monastery of the Holy Trinity (Greek: Μονή Αγίας Τριάδος) (also known as Agia Triada, Ayías Triádhos, Ayia Triada; all meaning "Holy Trinity") is an Eastern Orthodox monastery in central Greece, situated in the Peneas Valley northeast of the town of Kalambaka.

The church was constructed between the fourteenth and fifteenth centuries and is included in the UNESCO list of World Heritage Sites titled Meteora.

The rock cliffs, dated by chemical analysis to be 60 million years old, were created during earthquakes, and are of sandstone and conglomerate formations caused by fluvial erosion.

[5] Prior to the twentieth century, Holy Trinity had a very difficult approach, requiring crossing a valley and climbing through the rock outcrop to reach the building's entrance.

In present day, one can walk from Kalambaka for 3 kilometres (1.9 mi) along a foot track to reach the monastery, or use a winch-operated lift.

[10] To the northeast, there is a chapel (Ιερός Ναός Αγίου Αθανασίου) dedicated to St. Athanasius of Tzertzi (Άγιος Αθανάσιος Τζέρτζης).

In the 14th century, the titular emperor of Serbs and Greeks, John Uroš, became a monk and moved to Meteora; he endowed, rebuilt and established monasteries here.

[3] These six – Holy Trinity, St. Stephen, Rousanou, St. Nicholas Anapafsas, Varlaam, and the Great Meteoron – make up the UNESCO World Heritage Site entitled Meteora.

Patrick Leigh Fermor is reported to have visited the monasteries here several decades ago, as a guest of the Abbot of Varlaam.

[6][7] It features in the climax to the film where Bond ascends the rock cliff and intrudes upon Aristotle Kristatos and Erich Kriegler to retrieve the ATAC decoder.