The objective of this study is to determine the influence of the principal's servant leadership on teacher performance at SMP Negeri 4 Laguboti. The research employs a quantitative inferential statistical method. The population consists of 32 teachers at SMP Negeri 4 Laguboti, with a sample size of 30 teachers selected from SMP Negeri 3 Lintongnihuta for the pilot test. Data were collected using a closed-ended questionnaire comprising 60 items. The data analysis results indicate a significant impact of the principal's servant leadership on teacher performance at SMP Negeri 4 Laguboti. The analysis of the relationship between variables X and Y yielded an rxy value of 0.527, which is greater than the critical value of rtabel(α=0.05,n=32) = 0.349, and a t-value of 3.394, exceeding the critical t-value of 1.684, indicating a positive and significant relationship between the variables. The simple linear regression equation obtained is ŷ = 33.949 + 0.735X. Hypothesis testing showed that Fhitung = 11.518, which is greater than Ftabel = 4.08, leading to the rejection of the null hypothesis (Ho) and acceptance of the alternative hypothesis (Ha). The study concludes that there is a positive and significant effect of the principal's servant leadership on teacher performance at SMP Negeri 4 Laguboti, with the coefficient of determination (r²) = 27.7%.