The purpose of this study is to determine and analyze the effect of occupational safety and health on performance through discipline variables as mediation in Energi Mega Persada Bentu-Korinci Baru Limited employees. The method used in this study is quantitative descriptive. The data collection technique used is by using a structured questionnaire. A structured questionnaire was conducted to obtain information from respondents about the Effect of Occupational Safety and Health on Performance Through Discipline Variables as Mediation in Energi Mega Persada Bentu-Korinci Baru Limited Employees. The population in this study were all Energi Mega Persada Bentu-Korinci Baru Limited Employees totaling 160 people. In this study, the Probability Sampling technique was used with sampling carried out using the census method where the entire population was sampled using the SEM technique. The results of this study indicate that Occupational Safety has a significant effect on work discipline. Occupational health has a significant effect on work discipline. Occupational safety has a significant effect on employee performance. This means that the company has provided work tools for Safety, Health & Environment where employees work where warning signs are always given so that employee performance can improve. Occupational health has a significant effect on employee performance. Work discipline has a significant effect on employee performance. This means that employees are very disciplined in working to comply with the rules that have been agreed upon together so that it improves employee performance. Occupational safety has a positive and significant effect on employee performance through work discipline. This means that with the increasing level of employee work discipline and supported by complete equipment in working, it will improve employee performance. Occupational health has a positive and significant effect on employee performance through work discipline. This means that the work discipline of employees always enters with working hours in accordance with company regulations and is supported by routine checks on employees so that it can improve employee performance.