Background The aim of this study was to establish the psychometric properties of the Korean Behaviour Problems Inventory (BPI‐01). Methods Fifty‐five allied professionals completed a content validity questionnaire about the Korean BPI‐01. To examine reliability, 52 individuals with intellectual disabilities residing in a medium‐sized residential home were evaluated by two occupational therapists trained in the administration of the Korean BPI‐01 through interviews with caregivers who had known the residents at least 6 months. Results Allied professionals’ responses supported the content validity of the Korean BPI‐01. The results of intraclass correlation coefficients and Cronbach's α indicate that the Korean BPI‐01 is a reliable instrument. Conclusions The results of the present study indicate that the Korean BPI‐01 holds adequate content validity and reliability for measuring behavioural problems in individuals with intellectual disabilities in Korean clinical settings.