DIS NO is a non-profit organization founded in Lausanne in 1995, dedicated to preventing child abuse and sexual violence against children. The association serves as a support and prevention service for individuals troubled by sexual thoughts or online behaviors involving minors. DIS NO also provides assistance to relatives and professionals. 

It operates in Swiss Romandy. When it was first established, DIS NO focused on preventive actions aimed at children, raising awareness about sexual abuse and teaching them to "say no," which inspired its name. After several years of activity, the organization realized that prevention could not rely solely on educating children. As a result, DIS NO began exploring other approaches to prevention. Since 2014, DIS NO has been providing support to individuals struggling with socially inappropriate thoughts toward children, as well as those who consume pornographic content involving minors.