Carl (or Karl) Schlesinger (August 19, 1813 – 1871) was a cellist.He originally played the violin.
From 1838 onwards, he worked as a solo cellist successively for the Pesth National Theatre in Budapest and the Imperial Opera orchestra in Vienna. He was a member of the Hellmesberger Quartet, which was formed in 1849.
In 1862 he was appointed professor of cello at the Vienna Conservatoire.