Oleg Vitalyevich Timofeyev (Russian: Оле́г Вита́льевич Тимофе́ев, Oleg Vital'evič Timofeev; born January 12, 1963 in Moscow), is an American musicologist and musician of Russian origin, specializing in lute and Russian guitar. He is best known for his pioneering work in the discovery, promotion, interpretation, and authentic performance of the repertoire for the 19th- and 20th-century Russian seven-string guitar.