The Influence of Teachers' Performance on Students' Learning Motivation. This study attempted to reveal: (1) the performance of Social Studies teachers at SMP Muhammadiyah Purworejo; (2) the students' learning motivation; and (3) the influence of the teachers' performance on students' learning motivation. The population was all students of SMP Muhammadiyah Purworejo. The sample was taken using the stratified random sampling technique. The data, analyzed using the partial correlation and regression analyses, were collected using the close-ended questionnaire. The findings showed that the teachers' performance belonged to good category (61.5%) while the students' learning motivation was in the high category (48.5%). The regression analysis showed that the determinant coefficient (R 2 ) was 0.353 (F = 13.508 sig = 0.000 <0.05).