Kallayi is one of the rivers in Kerala, India. It originates in Cherikkulathur in the Western Ghats at an altitude of 45 m and is 40 km long. It is linked to the Chaliyar River by a man-made canal on the south side of the small timber village of Kallayi lying on its banks. The Kallayi was known for its timber businesses, but now many of these have been closed down.