Metropolitan and Exarch Sergius of Singapore and South-East Asia (Russian: ?????????? ??????, secular name Nikolay Nikolayevich Chashin, Russian: ??????? ?????????? ?????; born June 19, 1974, Komsomolsky, Mordovian ASSR) is a bishop of the Russian Orthodox Church, primate of the Patriarchal Exarchate in South-East Asia (since 2018), head of the Administrative Secretariat of the Moscow Patriarchy (since 2009), and member of the Inter-Council presence of the Russian Orthodox Church (since 2009).