While Boulez stated on a number of occasions that he had no great interest in teaching or indeed any particular gift for it, he worked nevertheless in the course of his career in a variety of pedagogical contexts. In this chapter, I consider his work as an occasional teacher of composition, with the small number of individual students he accepted in the late 1950s in Paris for private sessions. Second, there is the teaching he transmitted in the body of lectures he delivered primarily at Darmstadt, Harvard and more extensively at the Collège de France. Finally, I explore his arguably more engaged pedagogical work, exemplified by the courses in analysis, composition and conducting he delivered in Basel in the 1960s, as well as his committed interaction with young composers, conductors and performers at the Lucerne Festival Academy from 2003 to 2015.