Der Rauchfangkehrer, oder Die Unentbehrlichen Verräther ihrer Herrschaften aus Eigennutz (The Chimney Sweep, or The Indispensable Betrayers of Their Lordships out of Self-interest) is an opera in three acts by Antonio Salieri to a German libretto by Leopold Auenbrugger. Originally designated as a Musikalisches Lustspiel (musical comedy), the work has the characteristics of both a German Singspiel and an Italian opera buffa.

The musical work was referred to as a practice in "the [German] language" for Salieri, as Joseph II put it. Here, Salieri was able to create virtuoso roles for some of the most famous singers of Vienna: Caterina Cavalieri, who created the role of Konstanze in Mozart's Die Entführung aus dem Serail, and Ludwig Fischer, who created the role of Osmin in the same opera. Fräule Nannette (Cavalieri) sings brilliant showpiece arias in her quest for Volpino's love, notably "Wenn dem Adler das Gefieder", and Herr von Bär (Fischer) consistently exhibits his ursine qualities by going down to E2 and D2 his two arias. Additionally, the opera brings out very much humour and entertainment through Volpino's astute character and the ladies' infatuation with him.