Chonthanudomlap, P. and Suphirak , S. 2025. Administrators’ Competencies Affecting the Effectiveness of Academic Administration in Schools under The Secondary Educational Service Area Office Nakhon Sawan. Education journal Faculty of Education, Nakhon Sawan Rajabhat University . 8, 4 (Dec. 2025), 37–50. DOI:https://doi.org/10.2774.EDU2025.4.281155.