Abstract: The purpose of this research is to examine the improvement of organizational citizenship behavior (OCB) which is influenced by the transactional leadership style through teacher trust and motivation to work in the state high school in Wawotobi. Data are collected by distributing questionnaires to the respondents of all state high school teachers in Wawotobi. Samples of this research are 82 high schools teachers in Wawotobi. This research uses descriptive analysis to determine the characteristics of respondents and distinguish respondents for each indicator variable. The instrument used to test the correlation among variables is SEM methods and analyzed by PLS (Partial Least Square). The results show that: (1) trust has a significant positive effect on organizational citizenship behavior (OCB) (2) work motivation has a significant positive effect on organizational citizenship behavior (OCB) (3) transactional leadership style has a significant positive effect on trust (4) transactional leadership styles has a significant positive effect on work motivation(5) transactional leadership styles does not have significant positive effect on organizational citizenship behavior (OCB). Keywords: Organizational Citizenship Behavior (OCB), Transactional Leadership Style, Trust, Work Motivation