BackgroundAnxiety occurs at elevated rates in developmental disorders and has been linked to executive functioning (EF) deficits. EF is strongly related to academic outcomes, but the relationship between anxiety and EF in the classroom has not been examined. MethodWe explored this relationship in two neurodevelopmental disorders, autism spectrum disorders (ASD) and attention-deficit/hyperactivity disorder (ADHD), in order to evaluate the specificity of associations between parent-reported anxiety and teacher-reported EF deficits in the classroom setting. ResultsGreater anxiety was associated with more classroom EF-related problems in the ASD group, but not in the ADHD group. Item-level analysis of classroom EF problems in the ASD group revealed associations between anxiety and difficulties with task initiation, attention, and completion. Anxiety was not related to total or item-level teacher-reported EF problems in the ADHD group. ConclusionFurther investigation into disorder-specific mechanisms that lead to the manifestation of anxiety symptoms may pave the way for more effective treatment and favorable academic outcome. Anxiety is related to poor EF in the classroom for students with ASD, which has implications for treating anxiety to promote positive academic outcomes and incorporating EF supports and training into treatment models for anxiety. The lack of association between anxiety and EF for students with ADHD was unexpected and warrants further exploration.