The Temple of Garni  is the only standing Greco-Roman colonnaded building in Armenia. A Ionic temple located in the village of Garni, Armenia, it is the best-known structure and symbol of pre-Christian Armenia.

The structure was probably built by king Tiridates I in the first century AD as a temple to the sun god Mihr. After Armenia's conversion to Christianity in the early fourth century, it was converted into a royal summer house of Khosrovidukht, the sister of Tiridates III. According to some scholars it was not a temple but a tomb and thus survived the universal destruction of pagan structures. It collapsed in a 1679 earthquake. Renewed interest in the 19th century led to excavations at the site in early and mid-20th century and its eventual reconstruction between 1969 and 1975. It is one of the main tourist attractions in Armenia and the central shrine of Armenian neopaganism.

The temple is at the edge of a triangular cliff which overlooks the ravine of the Azat River and the Gegham mountains. It is part of the fortress of Garni.One of the oldest fortresses in Armenia, it is mentioned as Gorneas in the first-century Annals of Tacitus. The fortress was strategically significant for the defense of the major cities in the Ararat plain. The site is in the village of Garni, in Armenia's Kotayk Province and includes the temple, a Roman bath with a partly preserved mosaic floor with a Greek inscription, a royal summer palace, the seventh century church of St. Sion and other minor items.

The precise construction date of the temple is unknown and is subject to debate. The dominant view is that it was built in 77 AD, during the reign of king Tiridates I of Armenia. The date is calculated based on a Greek inscription, discovered by artist Martiros Saryan in 1945 in the fortress wall, which names Tiridates the Sun (Helios) as the founder of the temple.