Geevarghese Mar Dionysius of Vattasseril (1858–1934) was an influential bishop and the 15th Malankara Metropolitan of the Malankara Orthodox Syrian Church. Born in Mallapally, he emerged as a prominent scholar of the Syriac language and a leading theologian. He played a vital role in navigating the church through internal divisions and was instrumental in establishing its official constitution. Recognized for his deep spiritual discipline and leadership, he is honored by his community as the Great Luminary of the Malankara Church.