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The purpose of this study is to investigate to what extent stakeholders’ project performance correlate to project success. To collect the empirical data, a particular questionnaire was designed and distributed among owners, consultant and contractor companies who are number 1 in performing oil, gas and petrochemical projects in Iran. The results of the research show that consultants play the most important role and owners the least in determining project success. And technical aspect of consultant and contractor performance has been used as the most important criterion of project success. Other theories, other type of projects, other companies and countries should be investigated to generalize the findings. This research concluded that consultants play the most important role in determining project success and technical aspect of their performance is the most important criterion for project success. Consequently, project success can be enhanced by focusing on consultants’ performance and other aspects of performance such as human, organizing and integration aspect in addition to technical aspect. To what extent stakeholders’ project performances correlate with project success is studied in this research paper.