The implementation of county government development projects in Westlands Constituency, Nairobi City County, is influenced by various factors at the global, regional, and local levels. Despite the significant progress made in the implementation of county government projects in Westlands Constituency, Nairobi City County, a number of challenges persist at the global, regional, national, and local levels. At the global level, the lack of standardized frameworks and guidelines for decentralization initiatives hinders the effective implementation of projects, leading to inconsistencies in governance structures and service delivery practices across different countries. The experiences of developed nations in decentralized governance may not always be easily transferable to developing countries like Kenya, where institutional capacities and resource constraints pose significant obstacles to successful project implementation. In Westlands Constituency, the specific challenges facing the implementation of county government projects include limited community participation, inadequate infrastructure maintenance, and inefficient project management practices. The absence of robust monitoring and evaluation mechanisms, as well as a lack of transparency and accountability in decision-making processes, contribute to the suboptimal performance of development projects in the constituency. These issues not only undermine the impact of county government interventions but also erode public confidence in the ability of local authorities to effectively address community needs. Challenges Facing Implementation of County Government Development Projects in Westlands Constituency, Nairobi City County. This study used a descriptive research design. The target population in this study were the development projects that were implemented in Wastelands Constituency, Nairobi City County between 2019 and 2023; The study focused on development projects such as road construction projects in Wastelands Constituency, Generally the target population were Project implementation team and stakeholders involved in development projects, there are 123 Project implementation team and stakeholders working under Wastelands Constituency development projects. The questionnaires will collect both quantitative and qualitative data. The quantitative data will be collected from rating scales and closed question within the questionnaires. The study found out that the implementation of County Government development projects in Westlands Constituency, Nairobi City County, faces significant challenges that hinder the efficient delivery of public services and infrastructure to local communities. This study aimed to identify and analyze key obstacles affecting project implementation in the region, focusing on governance systems, project management practices, and community participation. Through a comprehensive review of literature and empirical research, the study found that inadequate governance structures, inefficient project planning processes, and limited community engagement were primary factors contributing to project delays, resource mismanagement, and suboptimal project outcomes. Recommendations were proposed to strengthen governance systems, improve project implementation practices, and foster community participation to address these challenges and enhance the effectiveness of County Government development projects in Westlands Constituency.