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<jats:sec><jats:title>Background</jats:title><jats:p> Disruptive Mood Dysregulation Disorder was included in DSM-5 to accommodate new research addressing aspects of emotional dysregulation in children suffering from disruptive behavior problems. Despite growing interest in Disruptive Mood Dysregulation Disorder, few studies have looked at prevalence rates in European clinical populations. The primary objective of this study was to examine the prevalence and characteristics associated with Disruptive Mood Dysregulation Disorder in a Norwegian clinical sample. </jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p> The present study assessed children 6–12 years of age referred to a mental health clinic for evaluation and treatment ( N = 218, M<jats:sub> age</jats:sub> = 9.6, 60.4% boys) and compared those who did and did not meet Disruptive Mood Dysregulation Disorder diagnostic criteria. Diagnoses were determined using K-SADS-PL 2013. Associated difficulties at home and in school were measured by Achenbach Systems of Empirically Based Assessment battery. </jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p> In this clinical sample, 24% met the diagnostic criteria for Disruptive Mood Dysregulation Disorder. Children with Disruptive Mood Dysregulation Disorder were more likely than those without Disruptive Mood Dysregulation Disorder to be male (77% vs. 55%, p = .008), be living in poverty, have multiple mental health diagnoses (79% vs. 53%, p = .001), and have lower global functioning levels as measured by Children’s Global Assessment Scale (range 0–100, M = 47, SD = 8.5 vs. M = 57, SD = 11.4, p=&lt;.001). Finally, parents and teachers of children with Disruptive Mood Dysregulation Disorder reported lower overall competence and adaptive functioning, and higher total symptom load than children with other diagnoses. </jats:p></jats:sec><jats:sec><jats:title>Conclusion</jats:title><jats:p> Disruptive Mood Dysregulation Disorder is highly prevalent in a Norwegian clinical sample and displays a high symptom load. Our results are in accordance with similar studies. Consistent findings across the world may support Disruptive Mood Dysregulation Disorder as a valid diagnostic category. </jats:p></jats:sec>