Nikolay Dmitriyevich Zelinsky (; 6 February 1861 – 31 July 1953) was a Russian and Soviet chemist. Academician of the Academy of Sciences of the Soviet Union (1929).
Zelinsky studied at the University of Odessa and at the universities of Leipzig and Göttingen in Germany. Zelinsky was one of the founders of theory on organic catalysis. He was the inventor of the first effective filtering activated charcoal gas mask in the world (1915).