Research into the treatment of sexual offenders with an intellectual disability has increased over the past decade. This research can be used to investigate the efficacy of treatment; however, empirical limitations of the research make generalizations difficult. Marques has provided a framework for examining treatment efficacy that emphasizes the contribution of researchers and clinicians to report treatment outcomes rather than a strict reliance on rigorous empirical investigations, such as controlled outcome research. This review uses Marques' framework to present an overview about group treatment for sexual offenders with an intellectual disability using nine identified studies. This paper attempts to consolidate our knowledge about specific treatment issues, while demonstrating the varied outcomes that are reported in the literature. In employing this framework, the literature suggests that our knowledge can be substantially improved by research addressing specific areas of treatment. (Contains 2 tables.)