Spiritual quotient and happiness of 21st-century secondary school heads

School resources and personnel management require a deeper commitment to a strong spiritual foundation and positive work ethics. This study investigated the relationship between Spiritual Quotient (SQ) and happiness of 21st-century secondary school heads in the Congressional District of a Province for the school year 2023-2024. Thirty-eight (38) secondary school heads participated in the survey using the total enumeration sampling technique. A descriptive correlational design utilized the Spiritual Intelligence Self Report Inventory (SISRI-24) questionnaire for the Spiritual Quotient of Dr. David King and the Oxford Happiness Questionnaire (OHQ) for Happiness by Dr. Michael Argyle and Peter Hills. Spiritual Quotient was anchored on the spiritual/existential intelligence of Gardner's theory of Multiple Intelligences, while Happiness was based on Edward Diener’s Tripartite Model, the theory of Abraham Maslow's Hierarchy of Needs, and Dr. Martin Seligman's PERMA Theory of well-being. The Chi-square Test of Independence was utilized at a 0.05 significance level for the inferential statistics, while a simple thematic analysis was used to gather qualitative data. The quantitative result shows that Spiritual Quotient (SQ) correlated significantly with happiness. This finding may be leading to enhanced leadership performance and clarity of purpose. The findings emphasize the importance of Spiritual Quotient in school heads' happiness as leaders and suggest a professional development program to enrich Spiritual Quotient (SQ) and promote happiness in the 21st century. Keywords: spiritual quotient, happiness, school heads, leadership