Reducing the mortality of children under-5 (U5) is an essential part of the Sustainable Development Goal (SDG). Although Bangladesh has made progress in reducing child mortality, there remain inequalities among different sociodemographic groups. Education is one particular key factor with a multidimensional impact on child health and survival. This study assessed the association between parental education and U5 mortality using repeated cross-sectional Bangladesh Demographic and Health Survey data. The risk of child death was substantially low among educated parents. Children of secondary or higher educated mother and father were about 30% (hazard ratio [HR] = 0.697, 95% confidence interval [CI] 0.596 to 0.815,p< .001) and 26% (HR = 0.738, 95% CI 0.635 to 0.858,p< .001), respectively, less likely to die early. Children from wealthier households and born to mothers with long birth spacings were less likely to face an early death. The study findings emphasize on imparting education to parents as an intervention strategy to continue the reduction of child mortality rate in Bangladesh, which could be a policy direction toward achieving the SDGs.