Malwathu Maha Viharaya (also called Malwatta temple) is a Buddhist monastery located in Kandy, Sri Lanka. It is the headquarters of the Malwatta chapter of Siyam Nikaya and one of the two Buddhist monasteries that holds the custodianship of sacred tooth relic of Buddha kept in Sri Dalada Maligawa, Kandy.

The chief incumbent of the Malwathu Maha Viharaya is the Mahanayaka thero of Malwatta chapter of Siyam nikaya, a leading Buddhist monastic fraternity in Sri Lanka. The present chief incumbent of Malwathu Maha Viharaya is Thibbatuwawe Sri Siddhartha Sumangala Thero.