This research's objectives were: (1) to study the current and desirable conditions and transformational leadership of private schools in Khon Kaen Province; (2) to develop a transformational leadership model of private schools in Khon Kaen Province. The study is divided into 5 phases as follows. Phase 1: Composition studies: it was conducted by synthesizing ideas, principles, theories, and related research work to obtain the components to be determined as a conceptual framework. Phase 02: the study of the current and desirable conditions was carried out by collecting quantitative data from the population, including 128 private school administrators and 2,482 private school teachers (in total 2,610) and 360 randomly selected samples including 128 private school administrators and 232 private school teachers. The questionnaire used to collect the data had its mean content validity of 0.84 and confidence coefficient of 0.96. The obtained data were analysed by using software packages to find the following statistics: Frequency, Percentage, Mean and Standard Deviation. Phase 3: the development of a transformational leadership model; this was performed by taking the mean of the current condition data and desirable condition data to find the need value or PNImodified. Phase 4: collecting the qualitative data; this was conducted by organizing a Focus Group Discussion of 10 experts. Phase 5: collecting the qualitative data, it was conducted by organizing the public hearing from five highly-performing private schools consisting of one school administrator, five teachers each (a total of 35 people). The results of the analysis showed that the transformational leadership model of private schools in Khon Kaen Province was statistically rated at a moderate level. The needs were sorted: (1) ideological influence, (2) inspiration, (3) cognitive stimulation, and (4) individual consideration.