As the first comprehensive, intersectional examination of consensual non-monogamy, this handbook provides evidence-based research and practice across mental health disciplines on working with consensual non-monogamous (CNM) people and relationships. Leading experts in this emerging field provide counselor educators and practicing clinicians with the authoritative, essential information they need to serve a growing—yet frequently stigmatized—client population with affirmative, research-based, ethical care. Readers will learn basic information related to the development of their own unique relational information, acquire knowledge about CNM and CNM-focused communities, discern how identity, culture, and community impact intimacy and functioning, and take away practical recommendations, insights, and tools to promote CNM-affirming practice across settings, services and populations.