Food insecurity among children and their families negatively affects children's health and well-being. While the link between household resources and food insecurity is well-established, family income alone does not explain food insecurity; neighborhood disadvantage, shown to affect other areas of children's development, may also play a role in food insecurity. This study examines associations between neighborhood poverty and children's food insecurity, and whether family characteristics account for identified associations. We merge data on kinder-garten-age children from the Early Childhood Longitudinal Study-Kindergarten 2010-11 Cohort (ECLS-K:2011) with data on poverty rates from the American Community Survey (ACS) and on food access from the USDA's Food Environment Atlas using children's residential census tracts (N = 12.550 children in 3750 tracts). Using a series of multilevel models, we test for associations between neighborhood poverty, household economic, demographic, and parenting characteristics, and food insecurity at the child, adult, and household levels. Children living in higher-poverty neighborhoods are more likely to experience food insecurity than those in lower-poverty neighborhoods. Associations between neighborhood poverty and household-and adult-level food insecurity disappear when household characteristics are controlled. However, living in a very high poverty neighborhood remains predictive of child-level food insecurity, which may be an indicator of severe hardship. Findings indicate that neighborhood poverty may be a useful proxy to identify vulnerable children. (C) 2016 Elsevier Ltd. All rights reserved.