Mentors are an important part of many effective programs for girls, yet little information is available about the practical aspects of developing and supporting a successful mentor cadre. This toolkit pulls together lessons, tips, and insights that can be adapted and used to find, train, monitor, support, and evaluate mentors. The information is based on materials from programs for adolescent girls implemented by the Population Council. The resources are applicable to program planners, mentor supervisors, and mentors. All resources may be adapted to local contexts.