Baselios Thomas I Maphrian (Mal: ????? ??? ????????? ?????? ??????? ????????? ???, b: 22 July 1929) is an Indian bishop and primate of the Jacobite Syrian Christian Church, an autonomous Catholicate under the supreme ecclesiastical jurisdiction of the Syriac Orthodox Church.
He was enthroned on 26 July 2002 by Syriac Orthodox Patriarch Ignatius Zakka I Iwas, Patriarch of Antioch and All the East in a ceremony held in Damascus, Syria.
The office of the Maphrian has been vacant between 1996 (date of death of Baselios Paulose II Catholicos and 2002.