Sunil Kumar Singh (born 1971) is an Indian geochemist, a former professor at the Physical Research Laboratory and the director of the National Institute of Oceanography, India. He is known for his studies on low temperature elemental and isotope geochemistry and his researches are reported to have assisted in widening the understanding on the evolution of the Himalayas. His studies have been documented in several peer-reviewed articles; Google Scholar, an online repository of scientific articles, has listed 99 of them respectively.