Deepak Kumar (1 April 1946–26 January 2016) was an Indian condensed matter physicist and a professor at the School of Physical Sciences of Jawaharlal Nehru University.

Known for his research on quantum mechanics and other areas of condensed matter physics, Kumar was an elected fellow of the Indian Academy of Sciences.

[5] At IIT Roorkee, he collaborated with a number of scientists such as Mustansir Barma and S. Shenoy and studied superparamagnetic particles, magnetic anisotropy and disordered ultrametric models.

[6] Binary liquids, statistical mechanics, phase separation, Stern–Gerlach measurement and Bell’s inequality were some of the other areas of his study for which he collaborated with many physicists including Subir Kumar Sarkar, Sanjay Puri, Rupamanjari Ghosh, Ramamurti Rajaraman and A. K. Rastogi.

[10] Kumar also wrote about the sociological aspects of education and research,[11] contributed chapters to books published by others[12][13][14][15] and his work has drawn citations from others.