The Orthodox Church of the Czech Lands and Slovakia is a self-governing body of the Eastern Orthodox Church that territorially covers the countries of the Czech Republic and Slovakia. The current primate of the Czech and Slovak Orthodox Church is Rastislav of Prešov, Metropolitan of the Czech Lands and Slovakia since 2014.

Church Slavonic, also known as Church Slavic, New Church Slavonic, New Church Slavic or just Slavonic, is the conservative Slavic liturgical language used by the Eastern Orthodox Church in Belarus, Bulgaria, North Macedonia, Montenegro, Poland, Ukraine, Russia, Serbia, the Czech Republic and Slovakia, Slovenia and Croatia. The language appears also in the services of the Russian Orthodox Church Outside of Russia, the American Carpatho-Russian Orthodox Diocese, and occasionally in the services of the Orthodox Church in America.