Background: A growing body of evidence supports the use of Dialectic Behaviour Therapy with people with an intellectual disability. Various adaptation have been used in studies exploring the efficacy of this intervention. Method: A Dialectic Behaviour Therapy DBT skills training group was attended by people with an intellectual disability and their support staff. Standardised measures of psychological well-being, overall functioning and psychological distress were taken before and after the group and at 4 months follow-up. Qualitative interviews were conducted and analysed using thematic analysis. Results: Results suggested an improvement in all areas for three of the four participants, which were largely maintained at follow-up. Conclusions: This study adds to the growing literature supporting the use of DBT with people with an intellectual disability. The role of support workers in supporting generalisation of skills is considered. Ideas for improving the quality of future studies are considered.