Religious institutions and beliefs shape many aspects of life in Senegal, but systematic approaches to linking these dimensions to development policies and programs have been rare. Working with the Senegalese government, the Washington, D.C.-based World Faiths Development Dialogue (WFDD) and a Senegalese association (Cadre des Religieux pour la Santé et le Développement) have over the past three years engaged an interreligious group to support family planning strategies. The starting hypothesis was that religious leaders and communities influence (positively and negatively) family planning decisions and should thus be engaged in planning and implementation. This brief details the history of a Hewlett Foundation project, set within the regional Ouagadougou Partnership and the Senegalese government’s family planning program.