Ertatsminda Cathedral, Orthodox cathedral in Kaspi Municipality, Georgia.

Ertatsminda Cathedral is a 13th-century cross-domed church of St Eustathius in the centre of Ertatsminda village, Kaspi Municipality. It is built of dressed stone, with a dome resting on two free-standing piers and on the corners of the bema. The east facade has a large carved cross, deep decorated niches and framed windows.

Ertatsminda Cathedral dates from the first half of the 13th century and stylistically repeats 12th–13th-century monuments such as Ikorta, Pitareti, Betania, Kvatakhevi and Tsughrughasheni. From the early 17th century it served as the burial vault of the Saakadze family and their descendants, the Tarkhnishvili; their grave slabs remain in the church. It was substantially repaired in the second half of the 19th century, and in 1951 restoration work rebuilt the dome.

The cathedral serves as a gathering place for the local Georgian Orthodox community, where believers gather for religious services and observances. It represents the Christian traditions that have shaped daily life in this region for generations.

The cathedral is in the village of Ertatsminda and is most easily reached by car, as public transport options are limited in this rural area. Visitors should dress modestly, as it is an active place of worship.

The cathedral shares clear design features with the churches of Ikorta and Pitareti, suggesting that the same group of builders may have worked on all three sites. This makes it a useful reference point for anyone trying to follow the development of Georgian church architecture in the early 13th century.