Parental monitoring is a robust family-level predictor of youth well-being. Identification of variations by gender and/or race/ethnicity in parental monitoring has important implications for tailoring parenting practices. However, valid comparisons can only be conducted if cross-subpopulation measurement equivalence is established. Although measurement equivalence testing is widely used, it rarely (a) assesses intersectional identity (i.e., identity reflecting multiple factors such as race/ethnicity and gender) or (b) involves generating scores adjusted for nonequivalence. This is the first known study to do both with a parental monitoring measure. Measurement equivalence by sex (proxy for gender), race/ethnicity, and intersectional identity (sex by race/ethnicity) was assessed in the five-item Parental Monitoring Questionnaire administered to middle-school-aged Black, Latinx, and White girls and boys. Data were drawn from the second follow-up of the Adolescent Brain Cognitive Development Study ( = 9,082; 47.5% female, 52.5% male; 15.5% Black, 22.9% Latinx, 61.6% White). Moderated nonlinear factor analysis was used to identify group differences in item-level (intercepts and loadings) and factor-level (mean and variance) parameter estimates for a latent parental monitoring variable and subsequently to generate factor scores accounting for measurement nonequivalence. Intercepts or loadings for four items differed by sex, race/ethnicity, and/or intersectional identity. Factor mean and variance differed by race/ethnicity. Comparisons across the six groups using adjusted (factor) scores differed substantially from comparisons using unadjusted scores, underscoring the impact of systematic measurement bias on the valid assessment of parental monitoring in girls and boys who identify with these racial/ethnic groups. (PsycInfo Database Record (c) 2025 APA, all rights reserved).