Objective: This study was conducted to determine the correlation between family acceptance and HIV serostatus disclosure, and the correlation between peer support and HIV serostatus disclosure. Methods: This was a quantitative study with a cross-sectional design involving 176 MSM-PLWHA (Men who have sex with men-people living with HIV and AIDS). Instruments used in this study is Brief Scale of HIV disclosure, perceived acceptance scale, and peer group caring interaction scale. Results: The analysis showed a significant correlation between peer support and HIV serostatus disclosure (p-value 0.011), but there was no significant correlation between family acceptance and HIV serostatus disclosure (p-value 0.979). Conclusion: Peer support affects HIV serostatus disclosure in MSM-PLWHA. Peer group interventions need to be improved. Providing systematic peer group support for MSM-PLWHA and integrating intervention with peer support might need to be done for the next care plan for MSM-PLWHA in Medan, Indonesia.