In the three decades since the 1995 Beijing Platform for Action was endorsed by 189 countries, remarkable gains have been made for adolescent girls across key domains--from rising school completion rates to legal reforms that strengthen their rights, to reductions in the number of adolescent girls giving birth. Yet, glaring gaps remain: nearly 1 in 4 adolescent girls (150 million) still live in countries that do not grant them the same legal rights as boys to inherit assets from their parents, millions remain out of school, and child marriage, female genital mutilation, sexual violence and intimate partner violence persist.?Moreover, the progress that has been made has been uneven across regions. This report explores what has changed for adolescent girls over the past three decades and what has not, highlighting the current status of girls when trend data are not available.?To ensure every girl's rights to thrive, a set of policy recommendations are made. These look at feasible models and approaches that can help us accelerate progress towards our SDG commitments for adolescent girls, taking into account fiscal constraints and the array of urgent issues countries face today. [This report was co-produced by UN Women and Plan International.]