The aim of this research was to examine the effects of servant leader and integrity on principal performance in Catholic senior high schools in North Sulawesi, Indonesia. This quantitative research used questionnaire-gathered data from 75 teachers at 11 schools. The results of research show that the servant leader approach has significant positive effects on principal performance (sig. = 0,000 < 0,005; R[superscript 2]=0,799); the integrity of a principal can also have an effect on her/his performance in school (sig. = 0,000 < 0,05; R[superscript 2] = 0,758); and then there were noteworthy effects of the servant leader approach and integrity working simultaneously to improve the performance of the principal (R[superscript 2] = 0,788; sig = 0,000). This study shows how servant leader and integrity can support a positive impact on principal performance.