*Fellow of the Indian Academy of Sciences (FASc, 1965)
*Fellow of the Indian National Science Academy (FNA, 1974)
*Fellow of the Royal Society (FRS, 1982)
*Founding Fellow of The World Academy of Sciences (FTWAS, 1983)
*Honorary Fellow of the Royal Society of Chemistry (Hon. FRSC, 1989) 
*Foreign Member of the Academia Europaea (MAE, 1997)
*Honorary Fellow of the Institute of Physics (Hon.FInstP, 2007)
*Member of many of the world's scientific associations, including the National Academy of Sciences, American Academy of Arts and Sciences, Royal Society of Canada, French Academy, Japanese Academy, Serbian Academy of Sciences and Arts and Polish Academy of Sciences, Czechoslovak Academy of Sciences, Serbian Academy of Sciences, Slovenian Academy of Sciences, Brazilian Academy of Sciences, Spanish Royal Academy of Sciences, National Academy of Sciences of Korea, African Academy of Sciences, and the American Philosophical Society. He is also a member of the Pontifical Academy.