<![CDATA[This research is motivated by the fact that the professionalism of elementary school teachers' performance is still not optimal. The purpose of this research is the influence of coaching-based supervision and motivation on the professionalism of teacher performance. The quantitative inferential approach with the survey method Multiple linear regression Population of 100 teachers with a sample of 80 teachers in the Taman District Coordinator area with a purposive sampling technique. The research instrument was tested for validity and reliability. Data collection techniques through questionnaires with a linkert scale, observation and documentation. Data analysis through classical assumption tests (normality, multicollinearity, heteroscedasticity, and autocorrelation), multiple linear regression, ANOVA, t-test, F-test and determination coefficient (R²). The results of the research showed that the regression coefficient value (X1) B = 0.581 with a t-count value = 8.420 and a significant value (p) < 0.001. The motivation variable (X2) was B = 0.367, with a t-count = 5.773 and a significant value (p) < 0.001. The teacher performance professionalism variable was 94.6% (R² = 0.946%). Simultaneously, the principal's supervision based on coaching and motivation had a significant effect on the professionalism of elementary school teacher performance.]]>
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