Colonel Sir Ram Nath Chopra CIE, IMS (17 August 1882 - 13 June 1973) was an Indian Medical Service officer and a doyen of science and medicine of India. He is considered the "Father of Indian Pharmacology" since he was the first to establish a center of study and research in pharmacology in India, at the Calcutta School of Tropical Medicine.Chopra was commissioned a lieutenant in the Indian Medical Service on 1 August 1908 and promoted to captain on 1 August 1911.