The System of Ethics was published at the height of Fichte's academic career and marks the culmination of his philosophical development in Jena. Much more than a treatise on ethics narrowly construed, the System of Ethics presents a unified synthesis of Fichte's core philosophical ideas, including the principle I-hood, self-activity and self-consciousness, and also contains his most detailed treatment of action and agency. This volume brings together an international group of leading scholars on Fichte, and is the first of its kind in English to offer critical and interpretive perspectives on this work, covering topics such as normativity, belief, justification, desire, duty, and the ethical life. It will be an essential guide for scholars wanting to deepen their understanding of Fichte's ethical thought, as well as for those interested in the history of ethics more broadly.