Irkutsk Mosque, Islamic religious building on Karl Liebknecht Street, Irkutsk, Russia.

The Irkutsk Mosque is an Islamic place of worship located on Karl Liebknecht Street, featuring white walls, rounded windows, a central dome, and two minarets rising above the main structure. The building shows traditional Islamic architectural design adapted to suit the demands of Eastern Siberia's harsh climate.

In 1897 the merchants Zafigulla and Shaikhulla Shafigullin donated their urban estate on Salomatovskaya Street (now Karl Liebknecht Street) for a mosque, which opened that summer with the first adhan heard in Irkutsk. A school operated alongside it, and Mullah Garyh Baymuratov became the first district imam. The small wooden building was soon replaced by a stone mosque completed in 1905, with a tall minaret. Closed from 1939 to 1946, it housed flats, then warehouses and a vegetable store, and the minaret was dismantled; it was rebuilt in spring 2012.

The mosque serves as a gathering place for the Muslim community in Eastern Siberia, where people come for daily prayers and religious learning. It reflects the religious diversity present in this Siberian city and the role of faith in local life.

Visitors should remove their shoes before entering the prayer hall and dress modestly when inside the building. Women are welcome to visit and can borrow a headscarf if they do not have one with them.

The building was designed specifically for the extreme winter temperatures of the region, showing innovative solutions for insulation and heating. Its structure demonstrates how Islamic architectural traditions can adapt to dramatically different climates.