The background of this research is the problems faced by PT. Hariff Daya Tunggal Engineering related to organizational culture, knowledge sharing and employee performance. Therefore, this study aims to analyze and examine the influence of the variables studied in this study, including organizational culture, knowledge sharing, and employee performance at PT. Hariff Daya Tunggal Engineering. This study uses quantitative methods with the analysis technique used with descriptive and multiple linear regression analysis. The sampling technique used is by using a non-probability sampling technique using 30 employees as respondents. The results indicate that the organizational culture variable is in the good category, the knowledge sharing variable is in the good category, and the employee’s performance is in the good category. This study shows that there is a positive and significant influence on organizational culture and knowledge sharing on employee performance either partially or simultaneously. This implicate that the higher organizational culture and knowledge sharing, can increase employee performance of PT. Hariff Daya Tunggal Engineering.