Mental health disorders are considerably more prevalent among people with intellectual disabilities than in the general population, yet research on psychotherapy for people with dual diagnosis is scarce. However, there is mounting evidence to show that adults with a dual diagnosis can find help through group therapy and have more productive and meaningful lives with improved relationships. This article focuses on a review of evidence for interactive behavioral therapy, a widely used model of group psychotherapy for these conditions, and reviews the modifications drawn from the field of positive psychology and positive psychotherapy being incorporated into the model. A sample of a modified positive intervention, the virtual gratitude visit, is explained and suggestions for future research are given.