Augustin Bachinsky (born October 20, 1949, Lok) is the Patriarch of the World Council of the National Catholic Churches, Metropolitan of the Old-Catholic Church in Slovakia.

Augustin Bachinsky graduated from high school in Varin and then he started his compulsory military service. After it was done he began his education at the Roman Catholic seminary in Bratislava. He successfully completed the school and was ordained a priest in 1977. But because of disagreement with celibacy, he was forced to stop his service as Roman Catholic priest.

In 1980 he got married and began to work in Brno as an Old-Catholic priest, and keep a position of a clergyman from 1991 to 1997. After the dissolution of the Czech-Slovak Republic in 1995 he became administrator of the Old-Catholic Church in Slovakia as an independent legal entity and a state-recognized church. He has received the church as a full member of the Ecumenical Council of Churches in Slovakia, but at present the Old Catholic Church has observer status.

Bishop Bachinsky has a priestly sanctuary and an Eastern Church, which he received during his short priesthood in the Orthodox parish in Brno. He studied postgraduate studies at the Orthodox Faculty in Prešov, as well as at the Christian-Catholic Faculty in Switzerland (1994-1995). In an extraordinary Synode, in January 2004, the Old-Catholic Church in Slovakia decided to withdraw from the Utrecht Union because of the Utrechtian trend of women's ordinations and the blessing of homosexual couples.

Augustin Bachinsky was ordained as bishop on February 8, 2004 by Archbishop António José da Costa Rapos in Portugal. 

On December 11, 2008, after a successful examination and defense of his work at the Hussite Theological Faculty of Charles University in Prague, he graduated in Doctor of Theology (ThDr.).

In 2007, Augustin Bacinsky signed a Memorandum of Understanding with Archbishop Scott Earle McLaughlin of the Orthodox Anglican Church. In the memorandum, the two parties undertook to "do together what they do not need to do separately", including common prayer and meetings, mutual support, staff exchange, study, and other activities. Both sides will conduct a theological and ecumenical dialogue. They also recognize each other's baptism.

In 2015 Augustin Bacinsky signed "Intercommunion" with Evangelical Lutheran Church of Augsburg Confession (ELCAC) in Russia and made ELCAC as an Old-Catholic Province of St. Michael the Archangel. Lately Pavel Begichev became the metropolican of the province.

In 2017 was elected and elevated to the Patriarch of the World Council of the National Catholic Churches.