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Chalcedonian Christianity is the branch of Christianity that accepts and upholds theological and ecclesiological resolutions of the Council of Chalcedon, the Fourth Ecumenical Council, held in 451. Chalcedonian Christianity accepts the Christological Definition of Chalcedon, a Christian doctrine concerning the union of two natures in one hypostasis of Jesus Christ, who is thus acknowledged as a single person. Chalcedonian Christianity also accepts the Chalcedonian confirmation of the Niceno-Constantinopolitan Creed, thus acknowledging the commitment of Chalcedonism to Nicene Christianity.
In regard to their specific attitudes towards theological resolutions of the Council of Chalcedon, Christian denominations can be divided into:
Today, Chalcedonian Christianity encompasses the Catholic Church, the Eastern Orthodox Church and Protestant denominations, while non-Chalcedonian, or Miaphysite, Christianity encompasses the Oriental Orthodox Churches.