Aims:This study aims to provide an Iranian–Islamic model for a happy school for the elementary education system in Iran through a combined research approach, exploratory-sequential strategy, and tool development model. Method:The method of inductive thematic analysis in the qualitative phase and the method of survey research in the quantitative phase were used. In the qualitative phase, the field of study was the Iranian-Islamic sources and texts relating to happiness and, in the quantitative phase, the statistical population of the study was all the principals of the elementary school in the country during this study. In the qualitative phase of the study, the sampling method was purposeful, and in the quantitative phase, that was a probability sampling method. Data collection tools in the qualitative phase of this study were documents and resources and, in the quantitative phase, the tools were questionnaires. Finding: According to the findings in the qualitative phase, the study on the Iranian-Islamic happiness was done about three pervasive themes: inner happiness (vision oriented to happiness, character oriented to happiness and dynamism oriented to happiness), life oriented to happiness (happy life-world, spiritual and material well-being) and actions oriented to happiness (ritual, emotional, and social). The findings of the quantitative phase of this study indicate that the role of Iranian-Islamic happiness components in the realization of a happy school has been estimated above the average according to the statistical population of this study, and the Iranian-Islamic model for a happy school has a goodness of fit test.