Background. In Indonesia, diarrhea is one of the main causes of children morbidity and mortality. Parental knowledge, attitude, and behavior towards diarrhea are probably associated with diarrhea incidence in children. Objective. This study aims to explore the parental knowledge, attitude, behavior toward diarrhea and the association between those variables. Methods. A cross-sectional study was conducted in RSCM - Kiara in September 2015. Chi-square and Fischer test was used to analyze the association. Result. Among 102 subjects, 101 subjects (99%) had good knowledge , 55 subjects (53.9%) had positive attitudes, and 55 subjects (53.9%) had good behavior regarding children diarrhea. This study confirms that almost all of the parents had a good knowledge, yet almost half of them still had unfavorable attitude and behavior. Conclusion. There was no significant association between parental knowledge with behavior (p = 0.353) and between parental attitudes with behavior (p=0.29) toward children diarrhea.