The study examined the relationship between participatory budgeting and service delivery in Bundibugyo Local Government, Bundibugyo District. The research employed a mixed-methods approach, combining quantitative and qualitative data collection techniques. A sample of 220 respondents was drawn from a population of 300, including traditional leaders, local government officials, local council leaders, service providers, and local citizens. Data were collected through interviews and questionnaires, with purposive sampling used for key informants and simple random sampling for service providers and citizens. The study revealed a significant positive relationship between participatory budgeting practices and service delivery outcomes. Findings indicated that citizen involvement in budget formulation, transparency in resource allocation, and accountability mechanisms were strongly associated with improved service delivery in health, education, water, and roads sectors. However, challenges such as limited citizen awareness, inadequate funding, political interference, and capacity gaps hindered optimal participatory budgeting implementation. The study concluded that enhanced participatory budgeting practices could substantially improve service delivery outcomes in Bundibugyo Local Government. Recommendations included strengthening citizen engagement mechanisms, capacity building for stakeholders, increasing budget transparency, and establishing robust monitoring and evaluation frameworks.