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Purpose – The purpose of this paper it to provide practitioner and researcher lessons learned from applying a safety culture maturity model in the oil and gas industry in Thailand. It proposes a roadmap to improve safety culture maturity in an organizationDesign/methodology/approach – A safety culture maturity of 5 levels was chosen (Hudson’s model) to be applied in oil and gas company, and a questionnaire survey was conducted with 2,251 employees or 74% of the target group across the company. The results were used to develop a roadmap to improve the safety culture maturity of the company.Findings – Results from questionnaire survey showed a safety culture maturity level of the company is at 3.3, or calculative, with correlations among competency, work planning, worksite techniques, hazard reporting, responsibility and benchmarking elements. Using these findings, a roadmap was developed into 5 action plans to improve the safety culture maturity level for the company in the long term.Practical implications – This paper could serve practitioners as a guideline and a tool to understand and implement safety culture maturity concept in an organization. Originality/value - This paper also furnishes lesson learned for practitioners in the same and different industries on safety culture maturity implementation and assessment in organizations.