 In answering the foregoing questions, philosophers have been led to sharply differing views about moral motivation, and these views have sometimes been thought to have important implications for foundational issues in ethics. More precisely, differing views about moral motivation involve commitment to particular theses which have been thought to bear on questions about moral semantics and the nature of morality. Perhaps most famously, certain theses have been jointly deployed to support skeptical or anti-realist views in metaethics. This entry provides an overview of the main positions philosophers have taken in their efforts to understand and explain the phenomenon of moral motivation. It also briefly explains how key theses concerning moral motivation have come to inform and structure debates about moral semantics and the nature of morality.