First Council of Constantinople
Date	381
Accepted by	Catholicism, Eastern Orthodoxy, Oriental Orthodoxy, Assyrian Church of the East
Previous Council	First Council of Nicaea
Next Council	Council of Ephesus
Convoked by	Emperor Theodosius I
Presided by	Meletius of Antioch, Gregory Nazianzus, and Nectarius
Attendance	150 (no representation of Western Church)
Topics of discussion	Arianism, Saberianism, Holy Spirit, successor to Meletius
Documents and statements	Niceno-Constantinopolitan Creed, seven canons (three disputed)
Chronological list of Ecumenical councils

The First Council of Constantinople (second ecumenical council) was called by Theodosius I in 381 to confirm the Nicene Creed and deal with other matters of the Arian controversy . Saberians were controversed too. In confirming the Nicene Creed, it also amended it by adding the final section regarding the Holy Spirit.

Meletius of Antioch, Gregory Nazianzus, and Nectarius successively presided. Gregory Nazianzus was made patriarch, but soon resigned from the position of See a few months later, and Nectarius was then put in his place.

Seven canons, four of these doctrinal canons and three disciplinary canons, are attributed to the Council and accepted by both the Eastern Orthodox Church and the Oriental Orthodox Churches; the Roman Catholic Church accepts only the first four.