Objective: Gay males have increased risk for eating disorders compared to heterosexual males, establishing a need to develop and empirically evaluate programs to reduce risk for this population. The present study investigated the acceptability and efficacy of a cognitive dissonance-based (DB) intervention (The PRIDE Body Project) in reducing eating disorder risk factors among gay males in a university-based setting. Method: Eighty-seven gay males were randomized to either a 2-session DB intervention (n = 47) or a waitlist control condition (n = 40). Participants completed eating disorder risk factor assessments pre-intervention, post-intervention, and at 4-week follow-up, and those receiving the intervention completed post-treatment acceptability measures. Results: Acceptability ratings were highly favorable. Regarding efficacy, the DB condition was associated with significantly greater decreases in body dissatisfaction, drive for muscularity, self-objectification, partner-objectification, body-ideal internalization, dietary restraint, and bulimic symptoms compared to waitlist control from pre- to post-intervention. Improvements in the DB group were maintained at 4-week follow-up, with the exception of body-ideal internalization. Body-ideal internalization mediated treatment effects on bulimic symptoms. Conclusion: Results support the acceptability and efficacy of The PRIDE Body Project and provide support for theoretical models of eating pathology in gay men. (C) 2015 Elsevier Ltd. All rights reserved.