Erode Subramanian Raja Gopal (12 May 1936 – 15 November 2018) was an Indian condensed matter physicist, a former professor at the Indian Institute of Science and a former director of the National Physical Laboratory of India. Known for his research in condensed matter physics, Raja Gopal was an elected fellow of all the three major Indian science academies – the Indian National Science Academy, the National Academy of Sciences, India, and the Indian Academy of Sciences – as well as a member of the Institute of Physics. He was a former CSIR emeritus scientist, an alumnus of the University of Oxford and the author of three reference texts in condensed matter physics. The Council of Scientific and Industrial Research, the apex agency of the Government of India for scientific research, awarded