Gender-based violence (GBV) is a pervasive issue affecting women in Kenya’s informal sector, where they often face economic and social vulnerabilities. A mixed-methods approach was employed, including pre- and post-intervention surveys, focus group discussions, and participant observation over a one-year period. Female participants reported significant reductions in GBV incidents by 50% after the intervention, with themes indicating improved social support networks and confidence among members. The gender-based violence support groups were effective in mitigating GBV within the targeted community of female workers in Kenya’s informal sector. Continuation and expansion of these groups are recommended to further reduce GBV incidents and enhance women's empowerment. Gender-Based Violence, Support Groups, Female Labour Force, Informal Sector, Impact Evaluation