The Church of Gregory of Neocaesarea in the city of Irkutsk Orthodox Church located in the alley Krasnoflotskaya that in the historical city centre, in the courtyard of Trinity Church. This is the first of Irkutsk Church with a basis in the form of a rotunda.

The Church was founded in 1802 by the Author of this monument of architecture by the famous architect Anton Losev. Despite the fact that for all time of its existence, the Church building was rebuilt several times, preserved in the archives of the initial project. Therefore, today there is a real opportunity to restore the temple to its original appearance.

Throughout the nineteenth century the Church of Gregory of Neocaesarea was subjected to substantial and significant changes. In 1829 and 1830, she was damaged by heavy floods that hit the town. In connection with the dilapidated state of the temple in 1836 he made all the utensils, and sealed until 1845 In 1879 the Church was caught in a terrible area of the Irkutsk fire that destroyed the entire Central part of the city. To date, remained undated figure of the temple is already rebuilt and no longer clear composition, typical of the architect Anton Losev.

Currently, the Church of Gregory of Neocaesarea is a one - story stone Church with rotunda and four adjoining volumes. In the architecture of the Church is clearly seen in the transition from Baroque to classicism, since there are elements of both architectural styles. In addition, in some parts of the Church are visible some elements of traditional Irkutsk religious architecture.

Initially, the Church was topped with a hemispherical dome with a cupola. During core alterations capped vosniadou dome with a small octagon. Much has changed and the layout structure of the architectural monument. Temple Gregory of Neocaesarea has a modest decoration.