The aim of this research isi to analyze the impact of locusi of control (LOC) on the job satisfaction and job discipline of employees. This is an explanatory research with quantitative approach. The variables of this research are internal LOC, external LOC, job satisfaction, and job discipline. Thei scope of this research is identified as all the employees of PT Pumpindoi Ekamas Pratama, with the number of samples are 58 employees. Thati samples is obtained by using Slovini formula. Data is collected directly from respondents using a questionnaire. Datai analysis tools include descriptive analysis and inferential analysis which is processed usingi SPPS V23. The results indicates that : internali LOC strengthen the effect toward the jobi discipline. External LOC weaken the effecti toward the job discipline. Job satisfaction reinforce the effect as a moderation toward the job discipline. There are an reinforce interaction effect between internal LOC with job satisfaction as a moderation variable toward the job discipline. There iare an reinforce interactioni effect between external LOC with job satisfaction as a moderation variable toward the job discipline.