Boris Ottokar Unbegaun (Russian: Бори́с Ге́нрихович Унбега́ун, romanized: Boris Genrikhovich Unbegaun) (1898, Moscow – 1973) was a Russian-born German linguist and philologist, expert in Slavic studies: Slavic languages and literature. He worked in universities of France, Great Britain and the United States.^[1][2][3]

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He was a Professor of Slavonic studies at Oxford University and he was succeeded by his student Anne Pennington.^[4][5][6]

• La langue russe au XVIe siècle (1500—1550). — Paris: Inst. d'Études Slaves de l’Univ. de Paris, 1935.
• Les débuts de la langue littéraire chez les Serbes. — Paris: Champion, 1935.
• Grammaire russe. — Lyon-Paris, IAC, 1951 (English translation: Russian grammar. Oxford: Clarendon Press, 1957; German translation: Russische Grammatik. — Göttingen: Vandenhoeck & Ruprecht, 1969)
• L’Origine du nom des Ruthènes. — Winnipeg: Acad. ukrainienne libre des sciences, 1953.
• A bibliographical guide to the Russian language. — Oxford: Clarendon Press, 1953.
• Russian versification. — Oxford: Clarendon Press, 1956.
• Drei russische Grammatiken des 18. Jahrhunderts. Nachdr. der Ausg. von 1706, 1731 und 1750. — München: Fink, 1969.
• Studies in Slavic Linguistics and Poetics. — New York: New York University Press., 1969.
• Selected papers on Russian and Slavonic philology. — Oxford: Clarendon Press 1969.
• Russian surnames. — Oxford: Clarendon Press, 1972. Russian translation: Унбегаун Б.-О. Русские фамилии. — Moscow: Progress Publisher, 1989