Pattipati Ramaiah Naidu (a.k.a. Dr. Ramaiah Naidu) (June 3, 1904 – June 6, 1991) was a pioneering Indian nuclear Physicist, Medical Scientist and Radiologist who helped to establish the foundations of medical physics. He is better known for working under double Nobel Laureate, Marie Curie, for his post-doctoral thesis in Paris, France and pioneer in establishing up Radiology laboratory in India in 1938.