Backgrounds: The family plays an important role in regulating the diet of eating or managing hypertension in the family, it is important for families to have a good knowledge of the hypertension diet. Hypertension is now the leading cause of death in Indonesia and in the world. The prevalence of hypertension sufferers continues to increase every year, World Health Organization(WHO) shows that around 1.13 billion people in the world suffered from hypertension in 2015. In Indonesia the number of cases was 63.3 million and the number of deaths was 427,218 deaths due to hypertension and its complications. One way to prevent and control hypertension is the Dietary Approaches to Stop Hypertension (DASH), the purpose of this diet is to lower blood pressure, hypertension complications and help reduce fat accumulation. Aims: to describe the level of family’s knowledge about hypertension diet in a religious communities in Karawaci, Tangerang. Research Method: This study using quantitative methods with descriptive approach. The sampling technique uses accidental sampling with univariate data analysis. The research instrument was in the form of an online questionaire in the form of multiple choices using the Guttman scale. The population used was 72 Head of Family in a religious communities in Karawaci, Tangerang, sample is 32 samples. Results: The families who have a good knowledge from 32 respondents is 100%. Summary: All responden have a good knowledge, no one families who have a quite or less knowledge. Recommendation: The advice for other researchers to develop this research to look for a relationship between level of knowledge and implementation of a family hypertension diet with hypertension complication rates in family members.