Abstract Background: Prostate cancer remains a significant health concern, particularly among Black men who experience higher incidence rates and poorer outcomes compared to other racial and ethnic groups. Despite advances in survivorship care, disparities persist in the survivorship experiences, underlying the urgent need for research focusing on the unique needs of Black men in prostate cancer survivorship. By understanding the advocacy efforts and experiences of Black men who have completed prostate cancer treatment, we can identify strategies to better support this vulnerable population and inform interventions aimed at improving survivorship outcomes. Our study explored the advocacy efforts, experiences, and skills of Black men post-prostate cancer treatment to inform targeted interventions aimed at improving survivorship outcomes. Methods: Qualitative interviews were used to obtain information from 31 Black prostate cancer survivors who have completed treatment to explore their insights on survivorship and advocacy. Grounded Theory approach was utilized to analyze participants’ narratives. We employed open and axial coding techniques to extract themes from audio-recorded interviews that were then transcribed, verified and deidentified. Results: We identified several significant themes among Black men who completed prostate cancer treatment. First, participants actively engaged in "spreading the word," advocating for awareness and early detection within their communities through various channels. Second, they emphasized "the importance of advocacy," advocating for themselves and policy changes to address healthcare disparities. Third, participants were committed to "sharing information," openly discussing experiences and providing support to others navigating prostate cancer. Additionally, they highlighted the significance of "reflecting back," drawing from their life stories to offer valuable insights and guidance. Conclusion: This study sheds light on the advocacy efforts and experiences of Black men who have completed prostate cancer treatment, offering valuable insights into their perspectives and actions within their communities. Through the identification of five significant themes, including spreading awareness, advocacy importance, information sharing, and reflective support, this research underscores the proactive engagement of participants in addressing the challenges of prostate cancer. By amplifying the voices and experiences of these individuals, this study contributes to a deeper understanding of the multifaceted nature of prostate cancer survivorship within marginalized communities, ultimately informing future interventions and policies aimed at improving outcomes and reducing disparities in prostate cancer survivorship care. Citation Format: Fullwood, Mary Ellen Young, Folakemi T. Odedina. Science of Cancer Survivorship Advocacy: Perspectives from Black Prostate Cancer Survivors [abstract]. In: Proceedings of the 17th AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; 2024 Sep 21-24; Los Angeles, CA. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2024;33(9 Suppl):Abstract nr C038.