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This study aims to analyze the effect of internal communication and career devel-opment on employee performance with organizational commitment as a mediating variable at PT. BPR BKK Blora. This research employed a quantitative approach using a survey method. The population consisted of 426 employees, while the sam-ple comprised 81 respondents determined using the Yamane formula and random sampling technique. Data were collected through questionnaires and analyzed us-ing Structural Equation Modeling-Partial Least Squares (SEM-PLS). The results showed that internal communication had a positive and significant effect on organi-zational commitment, but did not have a direct effect on employee performance. Career development had a positive and significant effect on both organizational commitment and employee performance. Organizational commitment also had a positive and significant effect on employee performance. The mediation analysis in-dicated that organizational commitment fully mediated the effect of internal com-munication on employee performance, while it partially mediated the effect of ca-reer development on employee performance. These findings indicate that improving employee performance requires effective internal communication, continuous ca-reer development, and strengthening organizational commitment within the organi-zation.