Arthat St Mary's Orthodox Cathedral (Arthat Valiyapally) also called Kunnamkulam-Chattukulangara Church is an ancient church located in Arthat village of Kunnamkulam Taluk, one mile south of Kunnamkulam town, Thrissur, Kerala, India. This church did not participate in the Synod of Diamper. During the invasion of Tippu Sultan the church was arsoned and later reconstructed.