<![CDATA[The construction industry is one of the sectors with the highest occupational accident risks, making the implementation of Occupational Health and Safety (OHS) essential for ensuring worker well-being and improving project performance. This study aimed to analyze the effect of OHS implementation on the productivity of construction workers in Nias Regency, Indonesia. A quantitative research approach with a survey design was employed. Data were collected from 120 construction workers selected through purposive sampling from various construction projects in the region. The research instrument consisted of a structured questionnaire measuring OHS implementation, including safety training, personal protective equipment (PPE) utilization, safety supervision, hazard identification, and management commitment, as well as workers' productivity indicators. The collected data were analyzed using descriptive statistics, validity and reliability tests, classical assumption tests, and simple linear regression analysis with the assistance of IBM SPSS Statistics. The results indicated that OHS implementation in the surveyed projects was generally categorized as good, while workers' productivity was also found to be at a favorable level. Regression analysis revealed that OHS implementation had a significant positive effect on construction workers' productivity (β = 0.673, p < 0.001). Furthermore, the coefficient of determination showed that OHS implementation explained 45.3% of the variation in workers' productivity. These findings demonstrate that effective OHS practices contribute substantially to improving work efficiency, reducing accident-related disruptions, and enhancing overall project performance. Therefore, construction companies should strengthen safety management systems, improve training programs, and ensure consistent compliance with safety regulations to achieve sustainable productivity improvements. ]]>
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