The Diocese of Sydney, Australia and New Zealand (, also Australian and New Zealand Diocese) is the diocese of the Russian Orthodox Church Outside Russia in Australia and New Zealand headquartered in Sydney.
The first Russian Orthodox parish in Australia was St Nicholas Church (now St Nicholas Russian Orthodox Cathedral) founded in 1926 in Brisbane.
The Australian diocese of the ROCOR was founded in 1946 with episcopal see at St Nicholas Church in Brisbane.
In 1950, the episcopal see was moved to Sydney to the Saints Peter and Paul Cathedral.
In 1994, the Korean Orthodox mission was subordinated to Australian and New Zealand diocese by decree of the Synod of Bishops.
In February 2005, the diocese included parishes of Indonesia that are of Old Calendar or independent Churches.
In 2012, a Pakistan mission was established.
In 2015, Archbishop George (then vicar-bishop) joined other religious leaders in writing a letter to the then Australian Prime Minister Tony Abbott opposing the bills allowing same-sex marriage.
In 2023, a session of the Synod of Bishops of the Russian Orthodox Church Outside of Russia heard the Synod's President's petition to elevate Bishop George of Sydney, Australia and New Zealand to the rank of Archbishop. On July 12, 2024, Metropolitan Nicholas elevated his rank officially, at Sts Peter and Paul Diocesan Cathedral in Sydney.
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St John of Kronstadt Academy is a classical Pan-Orthodox school in Brisbane, Queensland, currently headed by Father Stephen David, a priest at Holy Annunciation Orthodox Church in Brisbane. As of 2025, it can accommodate up to 60 students from years Prep to 4. Archbishop George blessed the opening of the school in 2024, the Academy's opening educational year.
Abbreviated as SCMOI, Sts Cyril and Methodius Orthodox Institute is the sole tertiary educational institute of the ROCOR Diocese of Australia and New Zealand. It serves to educate lay Christians, and potientally equip future Orthodox clergy for their life. Archbishop George is the chairman, successor of Founding Chairman, Metropolitan Hilarion. Father Peter Hill, an archpriest who serves at the Church of Our Lady's Dormition, is the Principal of the Institute.