The main objective of this research is to determine the effect of Project CostrnManagement on Project Success on selected real estates in Addis Ababa. Whilernthe Project Cost Management processes measured by Plan Cost Management,rnEstimate Costs, Determine Budget, and Control Costs. The Project Successrndimension was measured by cost. Thus, the research focused on real estaterncompanies found in Addis Ababa namely Sunshine Real Estate, Country ClubrnDevelopers, Gift Real Estate, Pluto Real Estate, Noah Real Estate, andrnMetropolitan Real Estate. A quantitative research approach has been used tornstatistically determine the effect of Project Cost Management on Project Success.rnPrimary data collected through a questionnaire that has been designedrnsystematically and it was distributed among respondents working in the randomlyrnselected Real Estates companies. Descriptive statistics were applied to examinernthe effect of the Project Cost Management (the independent variables) on ProjectrnSuccess (the dependent variable). The result shows that Plan Cost Management,rnEstimate Costs and Control Costs have high effect on Success of the projects.rnHowever Determine Budget No effect on Success of projects. Generally, thisrnimplies that Project Success can be improved via improving Project CostrnManagement practices within the selected Real Estate companies.