The objective of this research was to study the current condition, the desired condition, needs assessment, and guidelines of the development of primary school administrators' attributes in the 21st century. This is descriptive research, and the research's sample group consisted of 370 school administrators and teachers; they were selected using stratified random sampling. The research tools were semi-structured interviews and questionnaires, which have 0.98 of precision and 0.60-1.00 of IOC. The statistical measurements which were used in this research were frequency, percentage, average, standard deviation, and the value of needs assessment using the Priority Need Index (PNI_modified). The research found that the overall current conditions and conditions in each dimension were at a medium level, whereas the overall desired conditions were at the highest level, which later were analyzed for the needs assessment of the primary school administrators' attributes in the 21st century in the following dimensions: 1) creativity and innovations, 2) visions, 3) being a desirable leader, 4) interpersonal relations, and 5) relations with work. Guidelines of the development of primary school administrators' attributes in 21st century comprise of: 1) the development of creativity and innovations, 2) opportunity provision to reach the 21st century's standards together in terms of the organization's visions, 3) reinforcement of 21st century leadership's attributes, 4) reinforcement of 21st century interpersonal relation's attributes, and 5) increase of the effectiveness of services which relate to the work within the 21st century organizations.