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Aberrant brain network development represents a putative aetiological component in mental disorders, which typically emerge during childhood and adolescence. Previous studies have identified resting‐state functional connectivity (RSFC) patterns reflecting psychopathology, but the generalisability to other samples and politico‐cultural contexts has not been established. We investigated whether a previously identified cross‐diagnostic case–control and autism spectrum disorder (ASD)‐specific pattern of RSFC (discovery sample; aged 5–21 from New York City, USA; n = 1666) could be validated in a Norwegian convenience‐based youth sample (validation sample; aged 9–25 from Oslo, Norway; n = 531). As a test of generalisability, we investigated if these diagnosis‐derived RSFC patterns were sensitive to levels of symptom burden in both samples, based on an independent measure of symptom burden …