Panikkervettil Thomas Panicker Geevarghese (21 September 1882 – 15 July 1953), known formally as Geevarghese Mar Ivanios, was a prominent Indian bishop and the first metropolitan archbishop and the founder of the Syro-Malankara Catholic Church. He was a key figure in the Malankara Reunion Movement, which sought to reunite the Malankara Church with the Catholic Church, culminating in his joining the Roman Catholic Church in 1930 along with a small group of followers.
Mar Ivanios was instrumental in founding the Bethany Ashram and played a vital role in the establishment of the Syro-Malankara Catholic Hierarchy, becoming the first bishop of the Archdiocese of Trivandrum in 1932. He was the first M.A. degree holder in the Kerala or Malankara Church.