Concerns around misinformation and disinformation have intensified with the rise of AI tools, with many claiming this is a watershed moment for truth, accuracy and democracy. In response, numerous laws have been enacted in different jurisdictions. Addressing Misinformation and Disinformation introduces this new legal landscape and charts a path forward. The Element identifies avoidance or alleviation of harm as a central legal preoccupation, outlines technical developments associated with AI and other technologies, and highlights social approaches that can support long-term civic resilience. Offering an expansive interdisciplinary analysis that moves beyond narrow debates about definitions, Addressing Misinformation and Disinformation shows how law can work alongside other technical and social mechanisms, as part of a coherent policy response.