The background of this research was based on the finding that the performance of Civil Servants at the Department of Education, Youth, and Sports of Sikka Regency was still not optimal. This condition was allegedly influenced by ineffective interpersonal communication and the implementation of a transformational leadership style that had not fully succeeded in encouraging improvements in Civil Servants performance. Therefore, effective interpersonal communication and transformational leadership were needed to ensure that organizational objectives could be achieved optimally. This research aimed to determine the effect of interpersonal communication and transformational leadership style on the performance of Civil Servants at the Department of Education, Youth, and Sports of Sikka Regency. This research used a quantitative method with an associative approach. The sampling technique used was saturated sampling, in which all Civil Servants at the Department of Education, Youth, and Sports of Sikka Regency were included as research respondents. Data were collected through questionnaires, interviews, observations, and documentation. The data analysis techniques included descriptive analysis and inferential statistical analysis, consisting of multiple linear regression analysis, t-test, F-test, and the coefficient of determination (R³). The descriptive analysis results showed that respondents' perceptions of the interpersonal communication variable achieved a score of 68.71%, categorized as good, while the transformational leadership style variable achieved a score of 73.78%, also categorized as good. The Civil Servants performance variable was likewise categorized as good. The t-test results showed that the interpersonal communication variable had a significance value of 0.001, which was lower than the 5% alpha level (0.001 < 0.05), indicating that interpersonal communication had a positive and significant effect on Civil Servants performance. The transformational leadership style variable also had a significance value of 0.011, which was lower than the 5% alpha level (0.011 < 0.05), indicating that transformational leadership style had a positive and significant effect on ASN performance.