This study aims to measure the Effect of Discipline on Employee Performance of PT Telkom Witel Cirebon. The method used in this study, using quantitative descriptive with more than 59 employees and using random sampling techniques. The method of collecting data through questionnaires also uses the interview method for some employees which is supported by the documentation method. Simple Linear Regression is a statistical method that functions to test the extent of the causal relationship between the causal variable (X) and the consequence variable (Y). The results of this study as a whole provide an overview of the application of work discipline to employees of PT. Telkom Witel Cirebon is in the fairly good category. It can be seen from the research results which show that employee work discipline with its dimensions together has a positive and significant effect on the performance of employees of PT. Telkom Witel Cirebon amounted to 47.8% while the remaining 52.2% was influenced by other variables. Through this research it can be concluded that the existence of a discipline program at work can affect the work performance of employees at PT. Telkom Witel Cirebon.