Abstract-The study appraised the participation of Quantity s Surveyors in the execution process of oil and gas projects and established the roles quantity surveyors play in such projects. The study also considered factors that affects the participation of quantity surveyors in oil and gas projects and adopted snowballing sampling techniques to survey quantity surveyors practicing in oil and gas firms, oil servicing firms and consultancy firms, using structured questionnaires to collect data. The data collected were analysed using percentiles and mean score item. The study revealed that quantity surveyors are involved in oil and gas projects, but on the average. As earlier said, the research identified four prevalent factors like Lack of Technical Knowledge/Skills with a mean item score of 3.93, Educational Curriculum in Tertiary Institutions with a mean item score of 3.89, Government Policies/Nigerian Content Development Act with a mean item score of 3.76 and Inter-Professional Rivalries with a mean of 3.67. The study recommended that the Nigerian Content Monitoring Board must ensure that the provisions for local professional services in the “Act” are obeyed strictly. Also, quantity surveyors must ensure they understand the provisions applicable to their involvement in oil and gas projects. It also recommended that the educational curriculum at tertiary institutions be revised so as to widen the scope of knowledge. It further suggested that quantity surveyors should be encouraged to be registered by International Cost Engineering Council [ICEC], and any associated professional body. Lastly, regulatory bodies or enforcement agencies could be established in order to and constrain every expert in the oil and gas sector to his or her profession, as well as organise expository seminars, launch books, journals, and other official publication so as to foster the awareness of the benefits of having quantity surveyors in such projects to every stakeholder/shareholder (includ