Providing sexuality education to children is one of the primary preventions for preventing sexual violence in children. Parents' knowledge, attitudes, and self-efficacy can affect the provision of this education. The purpose of this study was to describe the knowledge, attitudes, and self-efficacy of parents in providing sexual education to prevent sexual violence in children. This research is quantitative with a cross-sectional approach. The number of samples in this study was 396 parents who have children aged 12-17 years by purposive sampling. Univariate descriptive analysis was used. This study indicates that 56.3% of parents who have poor knowledge about preventing sexual violence are not supportive attitudes (52.5%), and 50.0% have low self-efficacy in preventing sexual violence in children. In addition, 71.5% of parents understand sexual violence against children in the form of rape and obscenity, and 33.1% still consider it taboo in providing education to prevent sexual violence in children. It is necessary to increase parents' knowledge, attitudes, and self-efficacy in providing education on preventing sexual violence in children as the primary prevention of sexual violence in children.