János Sajnovics de Tordas et Káloz (Tordas, 12 May 1733 – Pest, 4 May 1785) was a Hungarian linguist and member of the Jesuit order. He is best known for his pioneering work in comparative linguistics, particularly his systematic demonstration of the linguistic relationship between the Sami languages and Hungarian.
When Hell planned an expedition to observe the transit of Venus in Vardø, northern Norway of June 1769, he took Sajnovics with him. Hell had heard that the Hungarian and Lapp (Sami) languages were related and thought that Sajnovics, as a native Hungarian speaker, would be able to investigate the connection.
Sajnovics published the results of his research in his Latin-language book Demonstratio idioma Hungarorum et Lapporum idem esse (1770), which was seen as a breakthrough in the study of Uralic languages. His ideas were developed further by Sámuel Gyarmathi and Ágoston Gellért. He and Hell were elected members of the Royal Danish Academy of Sciences and Letters in 1790.
- Olaf Pedersen, Lovers of Learning – A History of the Royal Danish Academy of Sciences and Letters 1742–1992 (Munksgaard, 1992). ISBN 87-7304-236-6.
- Magyar tudóslexikon A-tól Zs-ig (Dictionary of Hungarian Scientists, A–Z, ed. Ferenc Nagy, Better-MTESZ-OMIKK (Budapest, 1997) pp. 693–694. In Hungarian
- Bo Wickman (ed.): The Uralic Languages: Description, History, and Foreign Influences (Leiden: Brill, 1988), pp. 792–818.
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