This study investigated the influence of stakeholder participation on the performance of irrigation projects in Garissa County, Kenya. The study was guide by stakeholder theory, realistic evaluation theory and systems theory. The study adopted a descriptive research design. The study targeted irrigation projects in Garissa County, Kenya. The targeted respondents were 85 respondents comprising of 10 project managers and 75 project team members. A census of 85 respondents was carried out. Questionnaires were used for the purpose of collecting primary data. The study conducted a multiple regression analysis to test the relationship between independent variables and dependent variable. The study found that stakeholder analysis, stakeholder engagement, stakeholder motivation, stakeholder monitoring and evaluation and had a positive significant influence on the performance of irrigation projects in Garissa County, Kenya. The study concluded that a stakeholder analysis helps an organization to gain more support and resources, increase project visibility, especially to executive stakeholders, prevent costly roadblocks later in the project cycle, communicate through the right channels at the right time and share the right level of information with the stakeholders. Engaging with different perspectives provides opportunities for learning and potentially changing the approach to ensure it fits the needs of stakeholders. Stakeholders with a high need for affiliation are moved to act because of their positive interest in and concern for others. Stakeholders play a critical role in the success of monitoring and evaluation (M&E) processes in development programs and policies. The study recommended that the organization should make sure to account for both internal and external stakeholders and create a clear stakeholder map that outlines each stakeholder's influence-interest level. The organization should analyse and categorize all your stakeholders using a mapping chart to manage how, where and when it should communicate with them. The organization should track the stakeholders so as to aware of the different groups. Project managers must ensure that stakeholders remain actively engaged to help garner a successful project outcome.