Objective: Given that the diagnosis of adulthood ADHD depends on the retrospective self-report of childhood ADHD symptoms, this study aimed to establish whether current mood affects the accuracy of retrospective self-ratings of childhood ADHD. Method: Barkley’s Adult ADHD Rating Scale (BAARS) was used to assess the retrospective self- and parent-reports of childhood ADHD symptoms of 160 adults with ADHD and 92 adults without ADHD. Self-rated current mood was also measured using the Hospital Anxiety and Depression Scale (HADS). Results: Higher BAARS self-ratings correlated with higher HADS self-ratings. Strongest correlations were evident between hyperactive/impulsive symptoms and anxiety symptoms. There was no relationship between current mood and accuracy of self-report. Conclusion: Current mood does not affect the accuracy of retrospective self-ratings of ADHD. Future research should aim to provide new measures of anxiety in ADHD to avoid the double counting of hyperactive/impulsive and anxiety symptoms.