This qualitative study was carried out to explore the potential for group psychotherapy as a useful tool in the management of dual diagnosis in Ireland. Existing treatment and therapeutic group interventions were examined, and new ideas were explored. The semi-structured interview used in this study, was designed to find out what the professionals dealing with dual diagnosis in a therapeutic capacity had to say. Seven participants who encountered dual diagnosis in their field of work were interviewed, and the findings were analysed thematically. This research supported the hypoFinal Year Project that group psychotherapy could be a useful tool in the management of dual diagnosis in Ireland. The need for a proper support system was emphasised as an essential element of this. No particular therapeutic approach was recommended. However, any form of therapy which might trigger relapse in either condition was treated with caution. There was a general concern that there was a lack of national policy and resources for dual diagnosis, which led to professionals providing a limited therapeutic service, with the exception of one facility, which was private. In conclusion, this research highlighted the need for more therapeutic support for dual diagnosis, particularly in group settings.