This mixed methods research was applied and divided into two phases. In phase one, was conducted with two main objectives: 1) to study the spiritual leadership of school administrators according to the perspectives of teachers in the Bangkok Metropolitan Administration (BMA); and 2) to compare the spiritual leadership of school administrators according to the perspectives of teachers in BMA, classified by areas, school sizes, education levels, and academic standings. The samples included 370 teachers from educational school inthe BMA. Next, multi-stage random sampling was used to select teachers from the BMAas participants in this research. The research instrument for phase one was a five-point Likert scale. In phase two, was conducted with the objective of creating spiritual leadership development guidelines for school administrators under the BMA. Using purposive sampling,there was a total of nine participants, including two deputy directors, four education supervisors, Department of Education, BMA; and three school administrators, BMA. The research instrument used was structured interviews. The results of the research found that: 1) the spiritual leadership of school administrators from the perspectives of BMA teachers were at high levels overall and in each aspect; 2) the spiritual leadership of educational institution administrators from the perspectives of teachers within the BMA classified by areas, school sizes, education levels, and academic standingswere not different overall and in each aspect; and 3) approaches to the spiritual leadership development of school administrators under the BMAinclude development of knowledge and skills, forming of attitudes, and implementation.