The HIV/AIDS pandemic remains a significant global health challenge, particularly in Sub-Saharan Africa, where the prevalence rates are among the highest in the world. This study investigated the impact of beneficiary participation on the performance of an HIV peer education program implemented by the Rwanda Network of People Living with HIV (RRP+) in Gicumbi District from 2017 to 2020. Researchers examined three specific areas: project planning, implementation, and monitoring. Stakeholder and Engagement Theory alongside Participation Theory were reviewed. The study adopted a descriptive research design with qualitative and quantitative approaches. The total study population for this research was be 3,938 that included Recipients of Care (RoC) and stakeholders directly involved in the HIV peer education project implemented by the Rwanda Network of People Living with HIV (RRP+) in Gicumbi District, Rwanda, from 2017 to 2020. A mixed sampling approach was employed to select participants for this research. This approach involves a combination of probability and non-probability sampling methods. Therefore, the sample size calculated using the Yamane formula was 387 Recipients of Care (RoC) and stakeholders. Both descriptive and inferential statistics were used to analyse the data. Findings indicated significant beneficiary involvement in strategic planning and annual plans, with mean scores of 3.78 and 3.50, respectively, on a 1-4 scale. Moderate familiarity with the Work Breakdown Structure (WBS) (average 3.22) was observed. Statistical analysis confirmed a significant positive impact on Project Performance (p < 0.05). Beneficiaries reported satisfactory healthcare and psychosocial support (mean score 0.99) and moderate satisfaction with supportive supervision (mean score 1.62). Capacity-building (average 1.02) showed room for improvement, yet still had a significant positive influence on Project Performance (p < 0.05). Limited involvement in monitoring (mean score 1.04) was observed, with high satisfaction in feedback meetings (mean score 4.15). Feedback acceptability (average 3.42) indicated moderate acceptability, also positively impacting Project Performance (p < 0.05). The positive unstandardized coefficient (B) of 0.398 indicate that increased healthcare and psychosocial support are associated with higher project performance. The positive unstandardized coefficient (B) of 0.026 suggest that supportive supervision has a relatively positive relationship with project performance. The positive unstandardized coefficient (B) of 0.293 highlight the importance of training beneficiaries during project implementation. The study recommended foster greater beneficiary involvement in project planning by conducting regular consultations, workshops, and feedback sessions. Review and refine the supportive supervision approach to address the varying levels of satisfaction among beneficiaries. Maintain regular and productive feedback meetings to capture beneficiary input and concerns. Enhance feedback collection and analysis processes to ensure feedback is incorporated into project activities effectively. Form a strengthened system of monitoring and evaluation in order to consistently evaluate performance of project as well as adapt to evolving requirements of the beneficiary. Additionally, formulate models of sustainability to ascertain that favorable and positive impacts of the project are preserved after its overall completion.