Rathnayake Mudiyanselage Kumarasiri Rathnayake (born 15 January 1967) is a Sri Lankan teacher, politician, former provincial minister and Member of Parliament. Rathnayake was born on 15 January 1967. He has a BSc degree from the University of Ruhuna. He is a teacher. Rathnayake was a member of Monaragala Divisional Council and Uva Provincial Council where he held a provincial ministerial portfolio for two terms. He contested the 2020 parliamentary election as a Sri Lanka People's Freedom Alliance electoral alliance candidate in Monaragala District and was elected to the Parliament of Sri Lanka.