BackgroundChild marriage hinders progress toward population health and development goals. Cost effective interventions that address the root causes of child marriage are needed to speed progress toward ending the practice. Nigeria is home to the largest number of married girls in Africa and many of these girls are members of the Hausa ethnic group, making efforts to tackle this issue particularly urgent among this population.MethodsRadio programs have the potential to inform large numbers of people about the harms of child marriage and change their support for the practice at low cost. We will develop a series of radio programs that address gender inequitable attitudes that motivate child marriage among Hausa communities in Ibadan, Nigeria. The content of the series will be based on input from the Hausa community. A baseline survey that measures knowledge of and support for child marriage will be conducted among randomly selected samples of Hausa adults in two cities: Ibadan, which will serve as the intervention site, and Akure, the control site. The radio programs will then air on Hausa-language stations in Ibadan over a three-month period, with the aim of informing persons of the potential harms of child marriage and reducing their support for the practice. A follow-up survey with the same individuals surveyed at baseline will be conducted in both cities. We will measure the impact of this intervention by comparing changes in these outcomes over time in the intervention site (Ibadan) with changes in the same outcomes in the control site (Akure).ConclusionThis study will investigate whether a series of targeted radio programs can reduce support for child marriage. The intervention is readily scalable and cost-effective and, if it effectively shifts attitudes toward child marriage, could represent a promising way of addressing child marriage in Nigeria.