Kuriakose Osthathios Thadathil

Kuriakose Mor Osthathios Thadathil (born 27 March 1962) is an Indian bishop of the Syro-Malankara Catholic Church. He serves as the Apostolic Visitor for the Syro-Malankara Catholic faithful in Europe and holds the titular see of Mariamme.

Early life and education Born in Amayannoor, Kottayam district, Thadathil completed his schooling locally before earning a Bachelor of Arts in English Literature from the University of Calicut. He underwent priestly training at St. Joseph's Pontifical Seminary, Aluva, and was ordained a priest on 30 December 1987 for the Archeparchy of Tiruvalla.

He later obtained a Doctorate in Liturgy from the Pontifical Oriental Institute in Rome.

Ministry Following his ordination, Thadathil served as a parish priest in various locations within the Archeparchy of Tiruvalla. Between 2001 and 2020, he served as the Master of Ceremonies for the Syro-Malankara Church and was the Chancellor of the Archeparchy from 2013 to 2017. In 2020, he was appointed as the Pastoral Coordinator for the Syro-Malankara community in the United Kingdom.

Episcopate On 19 September 2025, Thadathil was elected by the Synod of the Syro-Malankara Church as the Apostolic Visitor for Europe. He was consecrated a bishop on 22 November 2025 at St. Mary's Cathedral, Thiruvananthapuram. Moran Mor Baselios Cleemis served as the principal consecrator, assisted by Archbishop Thomas Mar Koorilos and Bishop Joseph Mar Thomas.