<![CDATA[This study is motivated by the importance of teacher performance in improving the quality of education at Assalam Islamic School Jeunieb. Teacher performance is influenced by various factors, including leadership and the work environment. This study aims to determine the effects of leadership and the work environment on teacher performance, both partially and simultaneously. The study employed a quantitative method with a causal associative research design. The study population consisted of 40 teachers, comprising 23 junior high school teachers and 17 senior high school teachers, selected using a saturated sampling technique. Data were collected through Likert-scale questionnaires and analyzed using validity, reliability, and classical assumption tests, multiple linear regression analysis, t-tests, F-tests, and correlation and determination coefficient analyses. The results indicate that leadership has a positive and significant effect on teacher performance (t = 2.044; significance = 0.048), as does the work environment (t = 2.451; significance = 0.019). Simultaneously, both variables have a significant effect on teacher performance (F = 6.294; significance = 0.004). The correlation coefficient (R) of 0.504 indicates a moderate relationship, while the coefficient of determination (R²) of 0.254 shows that both variables explain 25.4% of the variation in teacher performance, while the remaining 74.6% is influenced by other factors. Therefore, improving teacher performance requires effective leadership and a conducive work environment.]]>
