This study aims to find out: (1) The effect of principals' leadership (X1) on teacher performance (Y); (2) Effect of interpersonal communication (X2) on teacher performance (Y); (3) Effect of principals' leadership (X1) and interpersonal communication (X2) on teacher performance (Y). The population in this study were 387 teachers in Private Elementary Schools in Payung Sekaki Sub-district, and …