The objective of the study was to examine the influence of Coworkers, Work Conflicts, and the Work Environment on Employee Performance at PT Petindo Era Tangguh. The researcher utilized a quantitative descriptive approach, gathering survey data from PT Petindo Era Tangguh employees. The data analysis encompassed assessments of validity, reliability, classical assumptions, statistical models, t-tests, and F-tests. The research results revealed that Coworkers, Work Conflicts, and the Work Environment collectively affect Employee Performance by 48.4% as indicated by the adjusted R Square (R2), while the remaining 51.6% is influenced by other factors. In the t-test results, the Coworker variable (X1) had a value of 5.833, surpassing 2.037, with a significant value of 0.000 (< 0.05), leading to the rejection of Ho and acceptance of Ha. Conversely, the Workplace Conflict variable (X2) showed a value of 0.353, less than 2.037, with a significant value of 0.726 (> 0.05), resulting in the acceptance of Ho and rejection of Ha. Moreover, the Working Environment variable (X3) exhibited a value of 3.313, exceeding 2.037, with a significant value of 0.002 (< 0.05), leading to the rejection of Ho and acceptance of Ha. Additionally, according to the F-test, the Coworker (X1), Workplace Conflict (X2), and Working Environment (X3) variables in relation to Employee Performance (Y) produced a value of 11.642, surpassing 2.679, with a significant value of 0.000 (< 0.05). Thus, Ho was rejected, and Ha was accepted, indicating that the dependent variable simultaneously influences the independent variables.