Rajarethinam Arokiasamy Sundaram (RA Sundaram) (10 June 1905-28 August 1998) was an Indian Catholic clergyman who served as Bishop of Thanjavur (then known as Tanjore) from 4 February 1953 to 12 September 1986.
Sundaram finished his school education in Thanjavur and Palayamkottai. He joined St. Joseph's College, Thiruchirapalli for higher studies.
The Diocese of Thanjavur was created on 22 November 1952 and Fr. Sundaram assumed charge in 1953 as First Bishop of Thanjavur.
Our Lady of Health Hospital was the outcome of the ardent desire of Fr. Sundaram to render medical help to the sick and the needy people of Thanjavur. Because of Fr. Sundaram's efforts, on 4 April 1961 the hospital was opened by Mrs. Lourdammal Simon Minister of Local administrative of Tamil Nadu with 16 beds and 3 sisters. Currently this hospital has 200 beds in this half of beds free of cost. This hospital has multiple wards like Medical Ward, Surgical Ward, Maternity Ward, Pediatric Ward, Gynecology Ward, Ophthalmology Ward, Operation Theater, Casualty and Emergency unit and Out Patient department.