This study aimed to determine the effect of locus of control, self-efficacy, and social capital on the performance of agricultural extension workers with social capital as a moderating variable. In this study, the performance of the agricultural extension worker as a dependent variable, while the independent variable was the locus of control and self-efficacy, and this study used social capital as a moderating variable. This research was conducted at the Department of Agriculture and Food, Rembang Regency. The data collection method was carried out by using a census technique using a questionnaire with a sample of 120 respondents. The results showed that locus of control and self-efficacy had a positive and significant effect on the performance of agricultural extension workers. Then, social capital as a moderating variable was able to strengthen the influence of locus of control and self-efficacy on the performance of agricultural extension workers.