The Bassoon Concerto in B-flat Major, K. 191/186e, is a bassoon concerto written in 1774 by Wolfgang Amadeus Mozart. It is the most often performed and studied piece the bassoon repertory. Nearly all professional bassoonists will perform this piece at some point in their career. Mozart wrote the bassoon concerto when he was just eighteen years old, and it was his first concerto for a wind instrument. It is believed that it was commissioned by an aristocratic amateur bassoonist Thaddäus Freiherr von Dürnitz. Scholars believe that Mozart may have written five bassoon concertos but only his first one has survived.