Geevarghese Mar Dionysius of Vattasseril popularly known as Vattasseril Thirumeni (31 October 1858 – 23 February 1934) was a bishop of the Malankara Church, 15th Malankara Metropolitan, and a founder of the Malankara Orthodox Syrian Church. In 2003, the Church declared Mar Dionysius as a saint. He is known as 'The Great Luminary of Malankara Church' (Malayalam: Malankara Sabha Bhasuran), a title which the Church bestowed on him in recognition of his contribution to the Church.