<![CDATA[This study employed a quantitative associative approach with descriptive and verificative methods. The population consisted of 152 employees at Pertamina Regional 4 Zone 11 Field Cepu, and a sample of 60 respondents was selected using simple random sampling based on Slovin’s formula with a 10% margin of error. Data were collected through questionnaires and analyzed using IBM SPSS 25, covering validity and reliability tests, classical assumption tests, simple linear regression, multiple linear regression, t-test, an F-test, and the coefficient of determination (R2). The results show that safety culture, management commitment, and OHS program effectiveness were all in the very good category, with mean scores of 4.60, 4.55, and 4.55, respectively. Hypothesis testing confirmed that safety culture has a positive and significant effect on OHS program effectiveness (H₁ accepted; p = 0.000; R2 = 41.4). Management commitment also has a positive and significant effect on OHS program effectiveness (H₂ accepted; p = 0.012; R2 = 68.2). Simultaneously, safety culture and management commitment have a positive and significant effect on OHS program effectiveness (H₃ accepted; F count = 61.667 > F table= 3.16; sig = 0.000; R2 = 91.9%). The multiple regression equation obtained was Y = 24.619 + 0.783X1 + 1.111X2. Management commitment exerts a relatively stronger influence than safety culture on OHS program effectiveness. In conclusion, strengthening safety culture and management commitment is essential for improving OHS program effectiveness at CPP Gundih toward the sustainable achievement of zero-accident and zero-fatality targets.]]>
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