Multiracial youth is the fastest growing demographic in the USA, yet current research has only offered limited perspectives on their identities, relationships, and development. This handbook bridges that gap by combining cutting-edge research with practical guidance to support Multiracial young people's unique experiences and encourage future inquiry. It features clear explanations for how “Multiracial” is defined and explores the identity development, cultural navigation, and social challenges of Multiracial youth and their families. Featuring multidisciplinary contributions from experts across psychology, family studies, and child development, the chapters synthesize past and current research while guiding the creation of supportive environments, addressing microaggressions, and advocating for equity and representation. The volume equips researchers and practitioners to empower Multiracial youth and promote understanding among peers, while also providing a vital framework highlighting the unique Multiracial experience. It is an essential resource for any educational or community setting seeking to cultivate a sense of belonging.