Christian feast day: Gregory of Nazianzen (The Episcopal Church (US) and traditional Roman Catholic calendar)

Gregory of Nazianzus, also known as Gregory the Theologian or Gregory Nazianzen, was an early Roman Christian theologian and prelate who served as Archbishop of Constantinople from 380 to 381. He is widely considered the most accomplished rhetorical stylist of the patristic age. As a classically trained orator and philosopher, he infused Hellenism into the early Church, establishing the paradigm of Byzantine theologians and church officials.

The Episcopal Church (TEC), also known as the Protestant Episcopal Church in the United States of America (PECUSA), is a member of the worldwide Anglican Communion, based in the United States. It is a mainline Protestant denomination and is divided into nine provinces. The current presiding bishop of the Episcopal Church is Sean W. Rowe.

This article lists the feast days of the General Roman Calendar as approved on 25 July 1960 by Pope John XXIII's motu proprio Rubricarum instructum and promulgated by the Sacred Congregation of Rites the following day, 26 July 1960, by the decree Novum rubricarum. This 1960 calendar was incorporated into the 1962 edition of the Roman Missal, continued use of which Pope Benedict XVI authorized in his 7 July 2007 motu proprio Summorum Pontificum, and which Pope Francis updated in his 16 July 2021 motu proprio Traditionis custodes, for use as a Traditional Latin Mass.