A mahallah, mahalla, mahallya, or mohalla (Arabic: محلة maḥalla, Bengali: মহল্লা mahallā, Hindi: मोहल्ला mōhallā, Persian: محله maḥalla, Urdu: محله, Azerbaijani: Məhəllə) is a country subdivision or neighbourhood in parts of the Arab world, Balkans, Western and South Asia and nearby Nations.
Russia and former Soviet Union
A mahalla is an Islamic congregation or parish in Russia and a number of countries once part of the Soviet Union. Typically, a mahalla supports a single mosque. An imam is seen as the spiritual head of a mahalla. A mahalla is directly subordinate to a muhtasib and a territorial muhtasibat. 
- Allen J. Frank (2001). "Muslim Religious Institutions in Imperial Russia". ISBN 9789004119758.