Major Archbishop Cyril Mar Baselios, O.I.C. (16 August, 1935, Pandalam - 18 January, 2007, Trivandrum) was the Catholicos of the Syro-Malankara Catholic Church based in Trivandrum, Kerala. He was the first Major Archbishop of the Church, elevated by Pope John Paul II.
He had ecumenical relations with the Indian Orthodox Church, Mar Thoma Church and other St. Thomas churches.

He was ordained priest in 1960 and bishop in 1978.