ABSTRACT:- Every company is required to have a high level of discipline to achieve the company’s goals. A good discipline reflects the magnitude of one’s responsibility for the tasks assigned to him. With a high level of discipline, each employee will be able to complete each task and responsibility, even though the work it carries is complicated and difficult to complete. The purpose of this research is to know the Influence of Organizational Culture, Work Environment and Job Motivation on Employee Discipline in PT Jasa Marga (Persero) TBK, Medan Branch, either partially or simultaneously.The population of this research is all employees who work in PT. Jasa Marga (Persero), Tbk Medan Branch. The number of samples in this research is 67 respondents. Data were collected using observation and questionnaire. The data were tested using validity and reliability tests, and the data had to meet the classical assumptions. Furthermore, data analysis was performed by using multiple regression analysis, T-test, F-test, and determination coefficient.The results of this study indicate that there is a positive and significant influence of Organizational Culture on Employees Discipline. There is a positive and significant influence of Work Environment on Employees Discipline. There is a positive and significant influence of Motivation on Employees Discipline. There is a positive and significant influence of Organizational Culture, Work Environment, Motivation on Employees Discipline in PT. Jasa Marga (Persero), Tbk Medan Branch. The contribution of Organizational Culture, Work Environment, Motivation explains Employees Discipline is 61.8% while 38.2% is explained by other variables which are beyond the current research model.

Keywords:– Organizational Culture, Work Environment, Motivation, Work-Discipline