The main objective of this study was to evaluate the sustainability of internationally funded Catholic Church projects in the archdiocese of Nairobi, Kenya. To achieve this, the study focused on the following specific objectives: to establish the influence of financial stability on the sustainability of the projects; to investigate the relationship between public attitude and sustainability of the projects: to determine the influence of project design on the sustainability of the projects; and to examine the role of stakeholder participation on the sustainability of internationally funded projects in the Catholic Archdiocese of Nairobi, Kenya. This study used a survey research design to describe how the independent variables affected sustainability of the internationally funded projects in the Archdiocese of Nairobi. The target population was all the Catholic-run projects and the personnel operating within these projects. On the same line, 30% of the managers and senior staff were selected through simple random sampling and purposive sampling. This study applied two main research instruments in the collection of data, and these were interview schedules, as well as questionnaires, for primary data. The data collected in this study was analyzed using both quantitative and qualitative techniques. Findings show that 64.1% of the respondents agreed that stakeholders’ attitudes influence the sustainability of the project whereas 35.9% disagreed. From the findings 75% of the respondents agreed that financial resources influence the sustainability of a church-based project and 25% of the respondents agreed that financial resources influence the sustainability of a churchbased project. The study concludes that financial resources influence the sustainability of internationally funded church projects, and public attitude is positively related to internationally funded projects. Project design is positively related to the sustainability of internationally funded projects, and stakeholder participation is positively related to the sustainability of internationally funded projects. The study recommends that the project be fully funded before commencement of the project. The project managers and senior managers should understand the attitude of the public in relation to project sustainability. The project managers and all stakeholders should choose the best project design for the project. Stakeholders should fully participate in the projects’ management. Key terms: Evaluation, Sustainability, Internationally funded Catholic Church projects