This paper conducts a large, narrative literature review of interventions that seek to (1) increase educational attainment, (2) delay childbearing, and/or (3) delay marriage for adolescent girls in developing countries. Using 104 interventions from 70 studies, predominantly in developing countries, the paper summarizes the performance of 16 categories of interventions in improving each of the three outcomes of interest. It then provides high-level policy strategies to improve each outcome, informed by this review. Finally, the paper discusses several promising future research avenues to help close knowledge gaps and, thus, improve policy guidance for enhancing the well-being of adolescent girls in developing settings.