This study is an assessment of the impacts of the Matrix Project Management style in Host community-based projects by Oil and Gas industries in the Kokori community of Ethiope East Local Government Area of Delta State Nigeria. The study sought to find out the following: whether the matrix management style reduces delay in project delivery, improves the quality of projects, and reduces the number of failed projects as it concerns community development-based projects in the Kokori community in Ethiope East L.G.A of Delta State. A descriptive research design was chosen as the framework for the execution of this research. Thus, the study sourced data from three selected Oil and Gas companies carrying out community development-based projects in the Kokori community in Ethiopoe L.G.A of Delta State. Results and analysis of the survey conducted showed that supervisors and ordinary workers of the three companies under study believe that the Matrix Project management style to a great extent minimizes delay of the delivery of projects, improves the quality of projects delivered, and reduces the number of failed projects as it concerns community development based projects in Kokori Community of Ethiope L.G.A of Delta State. Test on null hypotheses formulated showed that there is no significant difference in the mean response of ordinary workers and supervisors on the extent Matrix Project management style will minimize the delay of the delivery of projects and the extent to which Matrix Project management style improves the quality of projects delivered as it concerns community development based projects in Kokori Community of Ethiope East L.G.A of Delta State. It is recommended that companies carrying out community development-based projects in Oil and Gas industries’ host communities should adopt the Matrix Project management structure for faster project delivery, high quality of projects delivered, and minimization of a number of failed projects.