Mykola Hryhorovych Kholodny (Ukrainian: Микола Григорович Холодний; 22 June 1882 – 4 May 1953) was an influential microbiologist who worked at the University of Kyiv, Ukraine in the USSR during the 1930s.

He is known for the Cholodny–Went model, which he developed independently with Frits Warmolt Went of the California Institute of Technology.

[5] In 1927 Cholodny proposed that the cells of the coleoptile are first polarized under the influence of uneven exposure to light, so growth hormone can diffuse more rapidly towards the side in the shade than in any other direction.

Sankewitsch published an article on Influence of weak electric currents upon the growth of the coleoptile in Plant Physiology.

[9] The same year he published an article on Charles Darwin and the modern theory of tropisms in Science magazine.