Rathnayaka Mudiyanselage Dharmadasa Banda (7 February 1938 – 23 October 2010), known commonly as R. M. Dharmadasa Banda, was a Sri Lankan teacher, lawyer and politician, a member of the Parliament of Sri Lanka and a former cabinet minister. He was a Basnayaka Nilame (Lay Custodian) of the Ruhunu Maha Kataragama Devalaya.