This commentary discusses the emergence of youth development research and evaluation in the nonprofit arena over the past 10 to 15 years. Included in this discussion is the establishment of the context for youth development research in nonprofits, a brief description of key examples of research from three youth nonprofits that illustrate the mission-driven, action-oriented application of research, and the need for researchers on adolescence to join together to advance the youth development field. Also included are links to nonprofit research and evaluation information online, especially from members of the National Collaboration for Youth.