Denys Raboula Antoine Beylouni (born 8 August 1930) is a Lebanese Syriac Catholic hierarch, who served as Archbishop of Aleppo of the Syriacs from 1991 to 2000 and subsequently as Curial Bishop of the Syriac Catholic Patriarchate of Antioch until his retirement in 2011. He has held the title of Titular Archbishop of Mardin of the Syriacs since 2000.
Beylouni was born on 8 August 1930 in Shiyyah (alternatively spelled Chayah) in Beirut, Lebanon. He was ordained a priest for the Syriac Catholic Church on 17 October 1954.
On 12 July 1983, Pope John Paul II appointed him Titular Bishop of Mardin dei Siri and Auxiliary Bishop in the Syriac Catholic Patriarchate of Antioch. He was consecrated bishop on 18 December 1983 by Patriarch Ignatius Antoine II Hayek.
On 1 June 1991 he was appointed Archbishop of Aleppo of the Syriacs. His resignation from the see was accepted on 16 September 2000.
Following his resignation from Aleppo, he was named Titular Archbishop of Mardin of the Syriacs and Curial Bishop of Antioch of the Syriacs, serving in the central administration of the patriarchate until 2011.
Beylouni participated in the Special Assembly for the Middle East of the Synod of Bishops, held in the Vatican in October 2010, as Titular Archbishop of Mardin of the Syriacs and Curial Bishop of Antioch of the Syriacs.
In interviews during this period, he spoke about the situation of Christians in the Middle East and the challenges facing the region's ancient Christian communities.
His resignation as Curial Bishop of Antioch was accepted on 1 March 2011.