Chanchal Kumar Majumdar (Bengali: [Cañcāla kumāra majumadāra]) (11 August 1938 – 20 June 2000) was an Indian condensed matter physicist and the founder director of S.N.

[4] On his return to India in 1966, Majumdar joined the Tata Institute of Fundamental Research as an associate professor, where he stayed until his move to University of Calcutta in 1975.

[6] At Calcutta University, Majumdar served as the Palit Professor of Physics at the University College of Science, Technology & Agriculture, and as the head of the department of magnetism and solid state physics of the Indian Association for the Cultivation of Science (IACS), carrying out his research at the Palit Laboratory of IACS and at the Variable Energy Cyclotron Centre.

[14] A year later, Majumdar worked on non-Debye stress relaxation of glassy systems along with Samuel Edwards, which also resulted in the publication of a notable article.

[6] Subsequently, he developed methods for calculating effective magnetic moment and physical quantities such as specific heat of finite Heisenberg chains; his work proved that violation of the rules related to non-degeneracy and avoided crossing existed.

[7] He modified the work of Michael R. Douglas and Sam Edwards on soda-lime glass and proposed a simpler explanation for its time-dependent stress relaxation and a formula to assess long time scales with regard to its order of magnitude.

He was associated with the conference on Observational Evidence for Black Holes in the Universe held in Kolkata in 1998 as a member of its scientific advisory committee.

[3] His mentor, Walter Kohn, later argued that the allegations stemmed from Majumdar's troubled relationship with trade unions under the influence of the Communist Party of India when the state was run by a Left Front government led by Jyoti Basu.

[32] He became an elected fellow of the American Physical Society[33] and delivered the Santanu Ghosh Memorial Lecture of the Indian Science News Association, Calcutta, both honours coming in 1991.

[1] Past speakers of the lecture include notable names such as Michael Berry, David Logan, Peter Littlewood, Narasimhaiengar Mukunda, Jainendra K. Jain, and Daniel I.

[38][39] A year after his death, the Indian Statistical Institute organised a Workshop on Strongly Correlated Electron Systems to honour his memory.