Gender-based violence (GBV) remains a significant public health issue in Nairobi's informal settlements, where social and economic inequalities exacerbate GBV prevalence. The study employed qualitative methods including semi-structured interviews with community leaders, focus group discussions with residents, and document reviews to analyse longitudinal data from to . A notable theme emerging was the significant reduction in GBV-related incidents reported by participants over time, indicating a positive impact of sustained intervention efforts. The findings suggest that consistent and community-centred prevention initiatives can effectively reduce GBV occurrences in Nairobi's informal settlements. Continuation and expansion of such interventions are recommended to further mitigate GBV prevalence.