St. Nicholas church of Tandzia is a hall church in the village of Tandzia, Bolnisi municipality; it stands in the grounds of the Sulkhan-Saba Orbeliani literary museum and was the court church of the Orbelianis. It was built in 1683 by Vakhtang, father of Sulkhan-Saba Orbeliani, who was mdivanbeg (chief justice) to Vakhtang V Shahnavaz. The church has two entrances: on the west (in use) and on the south (disused). On the east facade above the window, and on the west facade above the door, a large relief cross is carved. There are also two windows in the south wall.