The purpose of this research is twofold: 1) to study the application of the design thinking process in school administration under the Secondary Educational Service Area Office, Phitsanulok, Uttaradit, and 2) to explore the implementation of design thinking process in school administration of school administrators under the Secondary Educational Service Area Office, Phitsanulok, Uttaradit. This is a qualitative research study conducted using a sample of 57 educational administrators and 7 qualified personnel as participants. The research tools utilized include document analysis, questionnaires, and interviews, with statistical analysis involving mean values and standard deviations. The research findings indicate that: 1) The application of the design thinking process in school administration of school administrators is at its highest level. When considering each aspect, it was found that the model prototypes had the highest average, while data synthesis had the lowest average. 2) In terms of guidelines for applying design thinking processes in school administration, it was observed that confidence, empathy in work, and awareness of problems with open-ended questioning encourage creativity. Motivating and encouraging the expression of different ideas by participating in the development of models for use in problem-solving and the collection of information of suggestions, for improvement and development were key factors.