A diaspora is a scattering of a people from their original homeland, or the new community formed by such a people. Diaspora can also refer geographically to those areas of the world where Orthodox Christians live, but are outside the canonically defined territories agreed upon as belonging to an autocephalous or autonomous Orthodox church.
Some Orthodox peoples living in the West believe that they are living as dispersed peoples, as specific national and ecclesial "diasporas." The Church teaches that Christians, in full communion in faith, love, and sacramental life, should be at home in the One Holy Catholic and Apostolic Church in the new land in which they find themselves. The notion of a diaspora of Orthodox Christians is seen by many as an obstacle to jurisdictional unity throughout areas as yet canonically undefined.