Intrinsic motivation is fundamental for teachers to have. The principal plays a vital role in growing it so that activities in the school run smoothly. Therefore, proper leadership practices are needed. This study examines the effect of transformational school leadership on the intrinsic motivation of 335 private school teachers in South Kalimantan Province, Indonesia. The Krejcie and Morgan technique (1970) utilizes a statistical methodology to ascertain the optimal sample size, taking into account the confidence level, margin of error, and population utilized as a reference. This method enables the researcher to ascertain the necessary number of samples in an objective and scientific manner, hence preventing errors in sample size determination. The researcher effectively disseminated questionnaires to private school instructors in South Kalimantan through WhatsApp groups using Google Forms. The straightforward approach facilitated the collection of significant ideas from respondents who possess relevant expertise and information, hence fitting with the study's aims. It was concluded that transformational school leadership influences the intrinsic motivation of private school teachers in South Kalimantan Province.