The Holy Trinity Church in Irkutsk is working Orthodox Church that is located in the historical centre of the city, on the street 5-th Army. The style of architecture of the Church is a Prime example of "Siberian Baroque".

In 1718 started laying wooden Church in honour of the Holy Trinity with the chapel of the Holy apostles Peter and Paul. Modern single-storey Trinity Church was built on the site of the wooden. Its construction began in 1754, In may 1763, before the end of the building of the temple, the consecration of the warm chapel in honor of the Nativity of the mother of God.

In July 1763, during construction work collapsed stone arch of the temple, not without victims. This event pushed the completion date. In 1775 was consecrated the main altar of the Church of the Holy Trinity, and three years later the throne in honor of the Holy apostles Peter and Paul. At the end of 1785 to the bell tower of Trinity Church was raised to the bell.

It was also decided to erect the Church the Church in honor of St. Gregory Of Neocaesarea. The wooden Church was laid in September 1802, However, after several years, the building was severely dilapidated and has become unsuitable for hosting services. Therefore, in August 1836 the Church was closed. By mid-1863, thanks to the efforts of parishioner P. S. Veliskova completed the construction of a new stone Church building in honor of Gregory of Neocaesarea.

In 1846 in Holy Trinity Church was repaired. In January 1866, opened a parochial elementary school. In the 1930s the Church remained closed. In September 1949 the regional Executive Committee gave the Church to the device of the planetarium.

Modern Trinity Church was restored by architects B. and G. Shutov orange. After the reconstruction, it was transferred to the jurisdiction of the Irkutsk diocese. In 1991, the Church shone a new dome that shone white restored the ornaments of the exterior walls. In 1998, Bishop of Irkutsk and Angarsk Vadim consecrated the chapel of the Nativity of the virgin in the temple resumed service. In 2000, bell has set the gold cross. In April 2003, the tower raised the bells.