Kumaran Ratnam was a Ceylonese physician. He was the youngest son of Dr E.V. Ratnam founder of Ratnam Private Hospital (founded 1905) in Union Place, Colombo the oldest Hospital in Sri Lanka. A long-standing member of the Colombo Municipal Council from the Slave Island Ward, he was elected as Mayor of Colombo from January 1950 to December 1950.^[1]

He had two brothers, Raja and Mahesa and two sisters, Leila and Nasam. He was married to Meena Coomaraswamy, and lived in Barnes Place, Colombo. He was the brother-in-law of Mangala Moonesinghe.^[2] Following his death, the Short Road in Union Place was renamed Dr. Kumaran Ratnam Road.^{[citation needed]}