Background: Early marriageis driven by poverty and has manyeffectson girls' health: increased risk for sexually transmitted diseases, cervical cancer, malaria, death during childbirth, and obstetric fistulas. Girls' offspring are at increased risk for premature birth and death as neonates, infants, or children. This study aimed to investigate the contextual effect of social norm on early marriage among young women in Lampung, using multilevel analysis.Subjects and Method: This was a case control study conducted in Metro, East Lampung, Indonesia, from May to June 2018. A sample of 200 women was selected by random sampling, comprising 50 women who got married at under 21 years of age and 150 women who got married at ?21 years of age. The dependent variable was early marriage. The dependent variables were self efficacy, family income, family support, informational access at level 1 in multilevel analysis. Social norm were placed at level 2 in multilevel analysis. The data were collected by questionnaire and analyzed by multilevel analysis.Results: Marital age was postpone by self-efficacy (b= -1.93; 95% CI= -2.81 to -1.05 ; p<0.001), high family income (b= -1.20; 95% CI= -2.07 to -0.33; p=0.007), strong family support (b= -1.27; 95% CI= -2.35 to -0.19; p= 0.021), and access to positive information (b= -1.06; 95% CI= -2.08 to -0.04; p=0.042). Social norm had a contextual effect on marital age postponement with ICC= 14.56%.Conclusion:Marital age is reduced by strong self-efficacy, high family income, strong family support, and access to positive information. Social norm has a contextual effect on marital age postponement.Keywords: marital age postponement, self-efficacy, family income, family support, access to positive information, social normCorrespondence:Nurhayati Agtikasari. Masters Program in Public Heath, Universitas Sebelas Maret, Jl. Ir. Sutami 36 A, Surakarta 57126, Central Java. Email: agtikasari2@gmail.com. Mobile: +6282185965148.Journal of Maternal and Child Health (2019), 4(1): 1-8https://doi.org/10.26911/thejmch.2019.04.01.01