This study aims to analyze the effect of organizational culture and the physical work environment on employee performance at PT Arddy Mitra Karya Serpong, South Tangerang. This research uses a quantitative approach with a survey method. The population consists of 50 employees of PT Arddy Mitra Karya Serpong and a saturated sampling technique was applied so that the entire population became respondents. Data were collected through a Likert-scale questionnaire and analyzed using multiple linear regression, supported by validity, reliability, and classical assumption tests. The t-test results indicate that organizational culture has a positive and significant effect on employee performance (t = 4.699 > t-table = 2,012; p = 0.000 < 0.05) and the physical work environment also has a positive and significant effect (t = 4.095 > t-table = 2,012; p = 0.000 < 0.05). Simultaneously, the F-test confirms a significant joint effect of organizational culture and the physical work environment on employee performance (F = 59.574 > F-table = 3,195; p = 0.000 < 0.05). These findings imply that strengthening organizational culture values and continuously improving the physical work environment can optimally enhance employee performance
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