The objective of this study was to develop and validate a digital leadership development model of administrators in large-sized secondary schools under the Basic Education Commission offices in the northeast of Thailand. The findings showed that 1) the developed model comprised four key elements, namely factors of success development support, components of digital leadership, development process and strategies and digital leadership outcomes, 2) all elements of the developed model obtained suitability and feasibility at the highest levels, and 3) the guide book of digital leadership development model of administrators in large-sized schools under the Basic Education commission offices in the northeast of Thailand composed of Instructions, Principles, Objectives, Rationale and Background, Contents and References. All components of the guide book, in overall, received the highest level of feasibility.