The purpose of this study is to present the role of the Catholic Church of the Archdiocese of Ende to mobilize the Community of Believers (KUB) in the social movement to prevent stunting. The basis of the writing is research using the case study method in Lepembusu Kelisoke District, Ende Regency, Flores, East Nusa Tenggara. This study uses the Resources Mobilization Theory (RMT) as a framework. The results of the study show three things, namely first, the Archdiocese of Ende has a strong relationship with the Basis Communities. Second, Basis Comunities have human and material resources that are not strong enough, but have sufficient moral, cultural and socio-organizational resources. Third, the social situation that is the target of change is the condition of many Basis Communities which are organizationally weak, as well as the resources and culture of the people who are vulnerable to stunting. So, with the strength of existing relations and resources, the Archdiocese of Ende can work on changes in the social situation that can prevent stunting from happening