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Introduction. This study aims to describe the trends and racial/ethnic differences in prevalence of severe obesity among US children. Methods. We examined height and weight measurements from US children and adolescents aged 2 to 19 years using three National Health and Nutrition Examination Surveys (NHANES II: 1976–1980, N = 7 201, NHANES III: 1988–1994, N = 10 600, and NHANES 1999–2006, N = 15 980). We estimated the prevalence of severe obesity, defined as having a body mass index (BMI) above 35 kg/m² or 120% of the age‐ and sex‐specific 95^th percentile on the CDC reference standards, stratified by sex and age groups (aged 2–5 years, 6–11 years, and 12–19 years). We compared prevalence estimates among non‐Hispanic white, non‐Hispanic black, and Hispanic children. Results. The age‐standardized prevalence of severe obesity increased from 1.1%/1.3% (boys/girls) in NHANES …