This paper presents the findings of a review of publicly available, published evidence on the efficacy of development projects that self-identify as ‘girl-led’, both within academic literature and from established organisations working with girls. What is meant by ‘girl-led’, of course, varies hugely. Terms such as girl-led, girl-centred, and girl-focused are often defined fluidly and used interchangeably by various implementation agencies. Fried, Gathumbi and Bordallo (2019: 10) note that even among the members of the With and For Girls Collective, ‘There is no consensus around what “girl-led” means.’ They also comment that the ‘interchangeable use of the terms girl-led and girl-centred has resulted in many organisations defining themselves as girl-led but in reality, being only girl-centred’. Because our review contained a wide and diverse range of programme interventions, we divided this range into three categories during our analysis – for, with, and by girls (these are explained more fully in our conceptual framing section).