This research aimed to study the components and indicators and develop, try out, and evaluate the education administration model towards excellence in the 21st century for Thailand's primary schools. The research was divided into 4 phases: 1) study of components and indicators using the content synthesis method and in-depth interviews with nine school administrators in the best practice schools using semi-structured interviews. In addition, a focus group of 13 experts was organized: 2) develop a draft model from the components and indicators obtained from Phase 1 and collect feedback on the draft model from 9 experts using the connoisseurship technique, 3) try out the model in one volunteer primary school for three months, and 4) evaluate the model's accuracy, suitability, feasibility, and usefulness by five experts. The results showed that the education administration model towards excellence in the 21st century for Thailand's primary schools consisted of six components and twenty-seven indicators: 1) leadership of school administrators in the VUCA world (five indicators), 2) academic management towards excellence (five indicators), 3) strategic planning for empowerment in the 21st century (four indicators), 4) human resource management in the digital age (five indicators), 5) organizational management of change (four indicators), and 6) focusing on students, stakeholders, and building relationships in the digital world (four indicators).