The Orthodox Church in America (OCA) is an Eastern Orthodox Christian church based in North America. The OCA consists of more than 700 parishes, missions, communities, monasteries and institutions in the United States, Canada and Mexico. In 2011, it had an estimated 84,900 members in the United States.

Russian Orthodoxy is the body of several churches within the larger communion of Eastern Orthodox Christianity, whose liturgy is or was traditionally conducted in Church Slavonic language. Most Churches of the Russian Orthodox tradition are part of the Eastern Orthodox Church.