This study evaluated the sensitivity/specificity of a global sum score (GSS) from the Behavior Assessment System for Children, Second Edition, Executive Function screener (BASC-2-EF) at classifying children with/without ADHD and/or reading disability (RD). The BASC-2 Teacher/Parent Rating Scales (TRS/PRS) were completed for children (8-12 years old; 43.1% female) with no diagnosis ( = 53), RD ( = 34), ADHD ( = 85), co-morbid RD/ADHD ( = 36), and other diagnoses ( = 15). Receiver operating characteristic (ROC) curve analyses evaluated the sensitivity/specificity of the BASC-2-EF GSS at discriminating between children with/without ADHD or RD. Area under the curve (AUC) scores indicated the sensitivity/specificity of the BASC-2-EF GSS at discriminating between children with/without ADHD (TRS: AUC = .831, < .001; PRS: AUC = .919, < .001), with/without RD (TRS: AUC = .724, = .001; PRS: AUC = .615, = .101), and with ADHD or RD through post hoc analysis (TRS: AUC = .674, = .006; PRS: AUC = .819, < .001). The findings support utilizing the BASC-2-EF GSS when differentiating ADHD from RD and typical development.