This paper aims to identify and synthesise the types of school-based art therapy interventions, and appraise the effectiveness for children aged 5-12. The searches included ten major electronic databases, grey literature, and contact with experts in the field. Six completed and two on-going studies were identified. Art therapy was delivered to children with asthma, behavioural disorders, oppositional defiant disorders, separation anxiety disorders, learning disorders, and disruptive behaviours. All interventions were delivered over 7-25 sessions, and lasted 40'-60' per session.The sample sizes ranged between 20-109 participants, providing this systematic review with data from 247 participants. The findings suggested that art therapy is effective in improving children's quality of life; anxiety; self-concept; problem-solving skills, attitudes towards school; emotional and behavioural difficulties. The follow-up findings were also promising; though confirmatory evidence is needed. The risk of bias in most studies was high or unclear, highlighting the importance of following standardised reporting guidelines. Future research needs to focus on the identification of primary outcomes and measures that are tailored to art therapy interventions, and explore the (cost-) effectiveness of shorter versus longer durations of treatment.