Conjeevaram Srirangachari Seshadri FRS (29 February 1932 – 17 July 2020) was an Indian mathematician. He was the founder and "Director-Emeritus" of the Chennai Mathematical Institute. He was known for his work in algebraic geometry. The Seshadri constant is named after him. He was a recipient of the Padma Bhushan in 2009, the third highest civilian honor in the country.