This research and development aimed to: 1) study the components and indicators of creative transformational leadership of primary school teachers; 2) study the existing situation, and the desirable situation of creative transformational leadership of primary school teachers in the northeastern region of Thailand; 3) develop a program to strengthen creative transformational leadership of primary school teachers; 4) study the results of implementing the strengthening of the creative transformational leadership program of primary school teachers. The research instruments are comprised of: 1) a form for evaluation components and indicators of creative transformational leadership; 2) a questionnaire for the existing situation and the desirable situation; 3) a form for the assessment of the program to strengthen the creative transformational leadership of primary school teachers; 4) a form for evaluating the results of implementing creative transformational leadership; 5) a test of creative transformational leadership. The research found that: The creative transformational leadership of primary school teachers has 5 elements and 16 indicators, including 1) the vision, 2) the intellectual stimulation 3) creativity, 4) inspirational motivation, 5) flexibility. The results of the study of the existing situation and the desirable situation of creative transformational leadership of primary school teachers showed at practice level every dimension and at overall were high. The study result of how to strengthen creative transformational leadership indicates coaching and mentoring levels were at high. Developed programs to strengthen creative transformational leadership of primary school teachers consisted of 5 modules: 1) the vision which covers three indicators, namely, picture mind, challenge and goal, 2) the intellectual stimulation which covers three indicators, namely, promotion of wisdom use, rationality and the ability to solve problems, 3) creativity which covers four indicators, namely, the initiative idea, the flexibility of thinking, fluency of and the quality of thinking, 4) inspirational motivation which covers three indicators, namely, confidence, concentration in action, hope for success, 5) flexibility of thought which covers three indicators, namely, adaptation according to the situation, adaptation to problem solution and action ability in several dimensions. The second program was guideline-applied coaching and mentoring processes. The results of the study found significant difference between before and after use of the strengthening in that the level after use was higher than before using every module (p-value< 0.05).