Ivan Meshchaninov (24 November 1883 – 16 January 1967) was a Soviet linguist and ethnographer.
Born at Ufa, he graduated from the Faculty of Law at the University of St Petersburg in 1907 and then briefly studied at Heidelberg University before taking up archaeology back at St Petersburg, graduating in 1910. He headed the archives of Institute of Archaeology until 1923 focussing on cataloguing the Elamite antiquities there. Between 1925 and 1933 he led a number or archaeological expeditions to the Northern Pontic region and Transcaucasia.
He became a member of the Russian Academy of Sciences, as a historian, in 1932 and was director of the Peter the Great Museum of Anthropology and Ethnography from 1934 to 1937.
Meshchaninov was a follower of Nikolay Yakovlevich Marr and succeeded him as head of the Soviet Institute of Language and Thought from 1935 to 1950. He advocated that material culture goes through developmental stages and that migratory changes were secondary in this process. He published A New Theory in Languages, a guide to Marrism, and later Verb and Parts of Speech and Phrase Elements. As a linguist, however, Meshchaninov did not adhere straightforwardly to the radical Marrism, but rather tended to reconcile its ideas with a more objective historical linguistics and typology. He advocated the idea of notional categories that is also found in Otto Jespersen's works, studied polysynthetic languages and syntax.