Kostiantyn Mykolaiovych Tyshchenko (Ukrainian: Костянтин Миколайович Тищенко; 30 July 1941 – 23 July 2023) was a Ukrainian linguist, teacher, translator, Doctor of Philology (1992), and professor (1995). Tyshchenko is the author of more than 240 works on metatheory of linguistics, sign theory of language, linguistic laws, optimization of morphological descriptions of languages, linguopedagogy, problems of language development, Romance and Oriental linguistics, as well as series of articles on studies of German, Slavic, Celtic, Basque, Finnish and Altaic languages.[1] Teacher and polyglot speaking more than two dozen different languages. He lectures on general linguistics and conducts practical courses in French, Italian, Persian, Finnish, Basque, Welsh, and other languages. From 2001 to 2010, he was the head and leading researcher of the Linguistic Educational Museum, which he founded in 1992 at the Taras Shevchenko National University of Kyiv. Professor in the Middle East Department at the Taras Shevchenko National University of Kyiv (since 2011). Recipient of the Order of Merit of the Italian Republic (2003) and the Order of the White Rose of Finland (2005).