The current study examines the measurement properties and validity of a novel, abbreviated youth version of the UPPS-P Impulsive Behavior Scale that was developed to maintain measurement consistency with the existing adult short form. Specifically, we examined this scale's (a) factor structure; (b) measurement and structural invariance across four demographic characteristics: gender, ethnicity, household income, and parental education; and (c) correlates using a subset of 4,521 preadolescent (9- and 10-year old) children (53% male) from the baseline wave of the Adolescent Brain and Cognitive Development (ABCD) study, a large, community-based sample. Our findings supported a correlated 5-factor model, as well as a hierarchical model that recaptured the covariation among these 5 lower-order factors in three higher-order factors. Both of these models are consistent with the commonly observed structure of the UPPS-P among adults. We established measurement invariance across all demographic characteristics. Finally, our UPPS-P scales evidenced good convergent and discriminant validity with a broad swath of theoretically relevant external criteria, including self- and parent-reported personality and psychopathology, as well as lab-based neurocognitive tasks. Our findings indicate that we can assess multidimensional impulsivity in children reliably and validly by means of self-report, allowing assessment of this critical domain at early stages of development. We hope that this measure will facilitate the study of impulsivity in large-scale samples to begin to understand the evolution and long-term consequences of impulsivity. (PsycInfo Database Record (c) 2020 APA, all rights reserved).