Key Social Norms Take-aways This study demonstrates that social norms surrounding disclosure of violence—specifically the fear of gossip, judgment, or community backlash—can be shifted independently of attitudes about the acceptability of violence itself. When people believe that others in their community will support reporting violence rather than shame survivors, willingness to disclose increases, and actual incidents of violence decrease. This highlights the importance of focusing on disclosure norms, especially where changing attitudes toward violence is difficult. Objectives: The study aimed to evaluate whether a mass media campaign could reduce violence against women by shifting social norms around disclosure of intimate partner violence, without necessarily changing beliefs that justify such violence. Methods: A randomized field experiment was conducted in 112 villages in rural Uganda, involving over 10,000 participants. The study used pre- and post-intervention surveys to assess attitudes, social norms, disclosure behavior, and experience of violence. Villages were randomly assigned to view either the treatment films addressing violence and disclosure norms or placebo films on unrelated health topics. Intervention Details: The intervention included three short video vignettes integrated into public film festivals. The vignettes depicted dramatized cases of domestic violence with contrasting community responses—some showing silence and victim-blaming, and others showing supportive action. The goal was to model new disclosure norms through relatable narratives and characters, encouraging community support for survivors and discouraging passive acceptance. Results: The intervention did not significantly affect attitudes about the justification of violence. However, it led to a significant increase in women’s willingness to report violence to family members, local leaders, and police. Women exposed to the videos reported less fear of being labeled negatively for speaking out. Men and women in treatment villages were also more likely to expect community intervention in response to violence. Most importantly, women in treatment communities experienced lower rates of actual violence in the months following the intervention. Conclusions: Mass media interventions that shift expectations around disclosure can reduce violence against women even when underlying attitudes remain unchanged. Changing perceptions of social support for speaking out is a promising and scalable approach to reduce harm and create safer environments for women. This strategy is especially valuable in contexts where traditional norms condoning violence are deeply entrenched.