A growing body of research indicates that it is important for youth to have supportive relationships with adults to be able to achieve positive outcomes in academics, social settings, career development, health, and safety. However, many youth, including those who are young parents, lack such support and have few opportunities for developing positive relationships with older adults or other significant role models. This Mentoring Guidebook, developed in part to enhance the Young Parents Demonstration Program, offers user-friendly guidance for local workforce programs and agencies for laying the groundwork, designing an effective program, designing the mechanics of mentoring, running the program, and ensuring continuous improvement and impact.