Given its ruling status under the old regime and the sheer numbers of its adherents, Orthodoxy has enjoyed an especially prominent place in Russian history. But Russia’s non-Orthodox religions have been equally important for their smaller communities and have been implicated in Russian politics, both internal and external, in profound ways. Drawing on recent scholarship about a long neglected field, this chapter explores the interplay between the many faiths and denominations represented in Russia and the Soviet Union. It focuses in turn on the relationship between the state and religious institutions, on local religious communities, both real and imagined, and on the ways in which lived religion proved remarkably adaptable to change and fundamentally compatible with modernity.