Borys Dmytrovych Hrinchenko (Ukrainian: Борис Дмитрович Грінченко, December 9, 1863 – May 6, 1910) was a classical Ukrainian prose writer, political activist, historian, publicist, and ethnographer. He was instrumental in the Ukrainian cultural revival of the late 19th and beginning of the 20th centuries. Author of the first dictionary of the Ukrainian language, editor of a number of Ukrainian periodicals. He advocated the spread of the Ukrainian language in schools and institutions. One of the organizers and the first director of the Prosvita Society in Kyiv.