Urban diocese of Moscow is a conventional name of church administrative institution of Russian Orthodox Church in Moscow city. The head of the diocese (eparchy) is Patriarch of Moscow and All Rus'.
The diocese consists of stauropegic monasteries, cathedrals and churches of Moscow Kremlin, and parish churches, divided into 10 vicariates, which are, in turn, divided into 27 blagochiniyes (deaneries).
References
Urban Diocese of Moscow Wikipedia(Text) CC BY-SA