Holy Trinity Church, Orthodox church on 5th Army Street in Irkutsk, Russia

Holy Trinity Church is a brick structure with multiple levels and ornamental details built in the Siberian Baroque style. The exterior displays distinctive features typical of this regional architectural tradition with towers and decorative elements.

A first wooden Trinity church was built on this site in 1718, funded by the courtier Pyotr Medvedev with the blessing of Metropolitan Filofey. After less than 40 years it was dismantled, and the stone church was begun between 1754 and 1758. Its right chapel was consecrated on 5 May 1763, the left on 26 July 1775, and the whole church on 22 September 1778. Closed in 1930, it housed a planetarium from 1949 to 1986 and was returned to the eparchy in 1994.

The church is named after the Holy Trinity and stands at 5th Army Street 8 on the Angara bank. Its bells were hung on Good Friday 2003 and announced Easter to residents on 27 April that year; a golden cross was placed atop the bell tower in 2000. The building returned to the Irkutsk and Angara eparchy in 1994 and services resumed at Easter 1998.

The church stands at 5th Army Street 8, in the historic centre on the bank of the Angara, a short walk from the Kirov square area. It is an active parish of the Irkutsk and Angara eparchy, so visits are best timed outside services. The building has no step-free entrance described in the sources; ask on site about access to the interior.

The bell tower's 3,264 kg bell was hung in 1765, and the church kept its original form without major rebuilding until the Soviet period. From 1949 to 1986 the building housed a planetarium, for years the only one between Tomsk and Blagoveshchensk. A golden cross was placed on the bell tower in 2000, and new bells were hung on Good Friday 2003.