Grégoire Haddad (Arabic: غريغوار حداد; 25 September 1924 – 23 December 2015) was Archeparch of the Melkite Greek Catholic Archeparchy of Beirut and Byblos from 1968 to 1975.

He was known as the "Red Bishop of Beirut" promoting a secular "social movement" and a platform of rapprochement between Muslims and Christians with the onslaught of the Lebanese Civil War.

His father Amine Nakhle Haddad was a Protestant Christian and his mother Mathilde Nawfal belonged to the Melkite Greek Catholic Church.

In addition, Grégoire Haddad was active in publishing articles and giving media interviews about his theory about a rapprochement between socialism and the Church saying he represented increasing public opinion on more secularization.

[3] As political pressure mounted on him, followed by threat of sanctions within the Greek Catholic Church eventually leading Grégoire Haddad to resign from his post as Archbishop of Beirut and Byblos on 19 September 1975.

Pope Paul VI in a concurrent appointment gave him the Titular title as Archbishop of Adana of Greek Catholic Melkites (Turkey) with no actual congregation to tend to.