Different types of parental stress may influence children's health behaviors and weight. The aim of this review was to systematically examine the relationships between parental stress and child obesity. We reviewed 27 studies published through December 2018 and classified parental stress as parents' general stress, parenting role stress, and life event stress. There were positive relationships of parents' general stress and parenting role stress with child obesity among families with younger children and in longitudinal studies. The relationship between life event stress and child obesity differed by measures. We found that parenting role stress may be associated with unhealthy parenting practices. Contextual factors such as children's and parents' sex, race or ethnicity, socioeconomic status, and family structure appeared to play a moderating role in the relationship between parents' stress and child obesity, which warrant cautious interpretation. Our recommendations for future research include clarifying further the types of parental stress that influence child obesity, evaluating long-term relationship between parental stress and child obesity, and identifying possible mediating factors to support the relationship between parents' stress and child obesity. Researchers may also consider developing stress management programs for parents to address child obesity. KEYWORDS child health behaviors, child obesity, parental stress Child obesity is a health threat despite much effort to decrease the rate of obesity in children. In the United States, 18.5% of children between 2 and 19 years were affected by obesity (body mass index [BMI] ≥ age-specific 95th percentile of the Centers for Disease Prevention and Control [CDC] growth charts) in 2015 to 2016. 1 Children with obesity are more likely to be adults with obesity, which increases the risk of developing cardiovascular diseases, cancer, and type 2 diabetes. 2 The epidemic of child obesity and subsequent health issues highlight the importance of early identification of obesity risk factors in children to promote risk reduction. Among the multifactorial influences on child obesity, parents can impact their child's health behaviors regarding diet (eg, fruit and vegetable consumption), physical activity, and sedentary behavior (eg, screen time). 3 Family-based interventions targeting parents to improve child obesity have reported mixed outcomes: some have been effective, while others have not. 4,5 Such interventions have focused primarily on improving parenting skills, parenting practices, or knowledge of healthy lifestyles. 3,6 The risks for developing child obesity are not limited to behavioral factors. Other risks could include parents' psychological factors, especially parental stress, and these factors may be important in the relationship between parents and their child's obesity risk factors.Stress is defined as physiological and psychological responses to stressors that are actual events or perceived threats to an individual. 7Stress is based on individuals' perc...