The chapter shows how Kant’s ethical thought as reflected in the lectures, responds to Baumgarten’s works on moral philosophy. I argue that Kant chose Baumgarten’s textbooks for his classes for genuinely philosophical reasons. The thorough discussion of Baumgarten’s views provided Kant with important clues for developing an original position, even if mostly in opposition to Baumgarten. I illustrate this complex role of Baumgarten with a few significant examples, that also highlight some original aspects of Baumgarten’s position in comparison to Wolff’s: (...) (1) Kant follows Baumgarten’s in focusing on obligation as the crucial issue in moral philosophy, but Kant regards Baumgarten’s account as not satisfying. (2) Baumgarten’s sharply theistic foundation of morality is rejected by Kant. (3) Kant rejects also several significant aspects of Baumgarten’s division of ethical duties, thereby revealing profound differences in their conceptions of morality. (shrink)