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Background: Children, adolescents, and young adults with hematologic malignancies tend to receive high‐intensity end‐of‐life care (HI‐EOLC), but sociodemographic and hospital‐based predictors of HI‐EOLC remain unclear. Methods: The authors conducted a population‐based, retrospective cohort study with the Premier Healthcare Database. They identified individuals with hematologic malignancies who were 0 to 39 years old at death and died between 2010 and 2017. HI‐EOLC was defined as experiencing 2 or more of the following: cardiopulmonary resuscitation, intravenous chemotherapy, hemodialysis, mechanical ventilation, tracheostomy placement, or an emergency department visit within the last 30 days of life and death in the intensive care unit. Multivariable logistic regression models were constructed to identify patient sociodemographic and hospital characteristics associated with HI‐EOLC. Results: Among 1454 decedents, more than half (55%) experienced HI‐EOLC. In multivariable models, patients treated in medium (adjusted odds ratio [aOR], 1.63; 95% confidence interval [CI], 1.07‐2.50) or large hospitals (aOR, 2.21; 95% CI, 1.45‐3.39), insured by Medicaid (aOR, 1.40 ; 95% CI, 1.09‐2.06), or receiving cancer‐directed treatment in the Northeast (aOR, 1.50; 95% CI, 1.05‐2.15) were more likely to receive HI‐EOLC. Conclusions: A majority of children, adolescents, and young adults with hematologic malignancies experienced HI‐EOLC, and the likelihood of HI‐EOLC was influenced by the hospital size, type of insurance, and geographic region. Further research is needed to determine how to mitigate these risks. Many children, adolescents, and young adults with hematologic malignancies experience intense end‐of‐life care across the United States. Predictors for more intense care may include 1) receiving care in larger hospitals, 2) having Medicaid insurance, and 3) receiving care in the Northeast. [ABSTRACT FROM AUTHOR]