Gopalasamudram Ramachandran (born 8.10.1922) is an Indian physicist and biophysicist, a member of the Indian Academy of Sciences (1950), its vice-president in 1962 — 64. He was born in Ernakulam. He graduated from the universities of Madras (1942) and Cambridge (1949). In 1942 — 47 he worked at the Indian Institute of Science (Bangalore). In 1952 — 70 he was professor and head of the department of physics at the University of Madras, and in 1962 — 70 also director of the Centre for Advanced Study in Biophysics; from 1970 he has been professor at the Indian Institute of Science.
His research was in optics, molecular biophysics, crystal physics, crystallography and X-ray structure analysis. He studied the molecular structure of collagen and developed its triple-helix model.
A member of a number of academies of sciences. The M. Saha (1971), C. Raman (1972) and J. Bose (1974) medals and others.