The Irkutsk Mosque is the oldest and largest mosque in the city. It opened its doors in 1905 to Muslim worshipers and was closed by the Soviet government in 1939 AD and after that it went through many changes until it was officially opened in the nineties, and since that time it still receives many local visitors The mosque is characterized by its large area, and it provides many facilities and services such as places designated for ablution and rooms for religious lessons, and there are separate prayer rooms for men and women, and the mosque organizes many banquets, especially in the holy month of Ramadan. As for its external building, it combines the Russian architectural style with the beautiful Islamic building.