"The Mentoring Toolkit 2.0: Resources for Developing Programs for Incarcerated Youth" provides information, program descriptions, and links to important resources that can assist juvenile correctional facilities and other organizations to design effective mentoring programs for neglected and delinquent youth, particularly those who are incarcerated. Section 1, "Mentoring: A Promising Intervention Strategy," contains a review of the literature on effective mentoring strategies. Information on the limited body of knowledge available on programs designed specifically for incarcerated youth is included. Section 2, "Characteristics of Juvenile Offenders," describes the learning, social-emotional, and behavioral characteristics of youth residing in juvenile facilities. Section 3, "Designing Effective Mentoring Programs for Neglected and Delinquent Youth," explores the challenges that should be considered and the major benefits of establishing mentoring programs for these youth. It also describes the critical elements that should be included in juvenile justice mentoring. Section 4, "Tools for Developing Mentoring Programs," presents links to specific tools and resources that can be used by program developers to design and implement effective programs, to minimize the duplication of this information in this document. Finally, section 5, "Program Overviews," contains brief descriptions of selected mentoring programs that serve youth who are delinquent and involved in the juvenile justice system. [Nathan Zaugg and Roger Jarjoura updated the Mentoring Toolkit initially published in 2008.]