This chapter focuses on the asset-based approach to community development. It provides the different types of assets that create opportunities for a nonprofit organization, describes the asset-mapping process, and explains the relationship between asset mapping and financial sustainability. The chapter introduces the theories, concepts, and approaches of asset mapping as a strategy to help nonprofit organizations identify obvious and hidden assets within their communities, and mobilize them to connect issues and needs with assets, and foster the financial sustainability of a nonprofit organization. It examines the community context of nonprofit organizations in relation to community groups, neighborhoods, and larger social systems that influence quality of life. The chapter includes the concept and theory of community capacity, models of asset-based development for building community capacity, empowering individuals and groups, generating funding from new sources, and creating additional paths toward financial sustainability.