Ranganathan Shashidhar (born 1 January 1946) is a US-based Indian condensed matter physicist and a former head of the Laboratory for Molecularly Engineered Materials and Surface of the Center for Biomolecular Science & Engineering, a division of the United States Naval Research Laboratory.
Known for his research on liquid crystals, Shashidhar is an elected fellow of the Indian Academy of Sciences and the senior vice president of Polestar Technologies, a US-based company involved in the development of sensing technologies.
The Council of Scientific and Industrial Research, the apex agency of the Government of India for scientific research, awarded him the Shanti Swarup Bhatnagar Prize for Science and Technology, one of the highest Indian science awards, for his contributions to Physical Sciences in 1984.