Subbaramiah Minakshisundaram (12 October 1913 - 13 August 1968), also known as Minakshi or SMS, was an Indian mathematician who worked on partial differential equations and heat kernels.

In 1949, the two wrote a paper together called, Some properties of the eigenfunctions of the Laplace-operator on Riemannian manifolds, in which they introduced the Minakshisundaram-Pleijel zeta function.

In his early years he learned Malayalam, but when his family moved to Chennai because of his father's job as a sanitary engineer they spoke Tamil.

[1] His family were Hindus, and as a boy Minakshisundaram would chant the Gayatri Japa and perform the Sandhyavandanam with his grandfather every morning and night.

After graduating Loyola College, Subbaramiah joined the University of Madras as a research scholar and worked in the library.