This research aimed: 1) to investigate the current situations and needs in developing visionary leadership of Thai primary school administrators; 2) to develop visionary leadership development program of Thai primary school administrators, and; 3) to evaluate the implementation of the developed program of administrators visionary leadership development in Thai primary schools. Research and Development was employed which consisted of three phases: Phase 1, the survey was used to analyze the current situations and needs of 395 primary school administrators as the samples; Phase 2, the administrators visionary leadership development program was verified by 7 experts, and; Phase 3, the development program implementation was evaluated and informed by 15 primary school administrators. The research instruments were the questionnaire, the evaluation form, semi-structured interview form. The statistic techniques used for data analysis consisted of mean, standard deviation, and PNI (Modified). The results showed that current situations were at high level, and needs in developing the visionary leadership was at the highest level. The developed visionary leadership development program of Thai primary school administrators consisted of three modules including: formulation vision module; communication vision module; and implementation vision module. The usage of the developed of administrators visionary leadership development program in primary schools could significantly affect quality of high level. In addition, administrators and teachers had satisfaction in the program use.