Optimal teacher's performance is one of the main factors in the student's learning achievement. Therefore, the study of variables that are thought to have an influence on teacher's performance is very important. The purpose of this study is to analyze the influence of (1) principal's leadership on teachers' performance; (2) organizational culture on the teacher's performance. And (3) principals' leadership and organizational culture together on the teacher's performance. The method of the

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... ch, is correlational research. The population in this study were teachers of senior high schools in Kepahiang Regency, totally 258 people. Samples were taken by cluster random sampling. The research sample consisted of 72 respondents. Data collection use questionnaire techniques. Data analysis used is descriptive analysis and inferential analysis. Descriptive analysis presents data characteristics of each variable in the form of data presentation, central size, and data distribution. Inferential analysis by analyzing the percentages of normality, linearity test, and regression significance. The results of this study are: (1) there is a positive significant influence between the principal's leadership on teacher performance; (2) there is a positive significant influence between organizational culture on teacher performance, and (3) there is a positive significant influence between principal leadership and organizational culture together on teacher performance.