Sergey Adolfovich Barjansky (Russian: Сергей Адольфович Баржанский) (1 May [O.S. 19 April] 1883 Odessa, Russian Empire – 29 May 1940 Wilkinsburg, Pennsylvania) was a Russian virtuoso cellist. Barjansky's cello was a Stradivarius instrument which became known as the Barjansky Stradivarius. This instrument is now played by Julian Lloyd Webber.