Background/Objectives Children with atopic dermatitis are at increased risk of both general behaviour problems, and those specific to the condition and its treatment. This can hamper the ability of parents to carry out treatment and manage the condition effectively. To date, there is no published instrument available to assess child behaviour difficulties in the context of atopic dermatitis management. Our aim was to develop a reliable and valid instrument to assess atopic dermatitis‐specific child behaviour problems, and parents' self‐efficacy (confidence) for managing these behaviours. Methods The Eczema Behaviour Checklist (EBC) was developed as a 25‐item questionnaire to measure (i) extent of behaviour problems (EBC Extent scale), and (ii) parents' self‐efficacy for managing behaviour problems (EBC Confidence scale), in the context of child atopic dermatitis management. A community‐based sample of 292 parents completed the EBC, measures of general behaviour difficulties, self‐efficacy with atopic dermatitis management and use of dysfunctional parenting strategies. Results There was satisfactory internal consistency and construct validity for EBC Extent and Confidence scales. There was a negative correlation between atopic dermatitis‐specific behaviour problems and parents' self‐efficacy for dealing with behaviours (r = −.53, p < .001). Factor analyses revealed a three‐factor structure for both scales: (i) treatment‐related behaviours; (ii) symptom‐related behaviours; and (iii) behaviours related to impact of the illness. Variation in parents' self‐efficacy for managing their child's atopic dermatitis was explained by intensity of illness‐specific child behaviour problems and parents' self‐efficacy for dealing with the behaviours. Conclusions The new measure of atopic dermatitis‐specific child behaviour problems was a stronger predictor of parents' self‐efficacy for managing their child's condition than was the measure of general child behaviour difficulties. Results provide preliminary evidence of reliability and validity of the EBC, which has potential for use in clinical and research settings, and warrant further psychometric evaluation.