Bishop Sebastian Vayalil (28 January 1906 – 21 November 1986) was the first bishop of the Syro-Malabar Catholic Eparchy of Palai, in Kerala, India. He was born at Palai, and took his B. A. Degree from the Maharaja's College, Trivandrum in 1928. He had his ecclesiastical studies at the St. Joseph's Ap. Seminary Mangalapuzha, Alwaye and was ordained priest on 21 December 1935. He took his L.T. Degree from the Training College Trivandrum in 1942. He was the Headmaster of St. Thomas Training School Palai, till he was appointed the Bishop of Palai, on 25 July 1950. He was consecrated Bishop by Eugene Cardinal Tisserent, Secretary of the Sacred Congregation for the Oriental Churches, on 9 November 1950 at St. Theresia's Church Rome and was installed in Palai Cathedral by the Most Rev. Leo. P. Ki