The purpose of this study is to examine the relationship of organizational culture, transformational leadership, and personality with Organizational Citizenship Behaviour (OCB) teachers, either individually in group. This study was conducted on 202 teachers of civil servants selected by multistage Proportional Sampling of 11 junior high school in Bogor City. This study used a type of combination methods that is sequential explanatory design that begins with a quantitative study then deepened with qualitative research. The purpose qualitative research after the implementation of quantitative research is to obtain a clarification of the results of quantitative research, wether qualitative research deepens, proves and gives meaning to quantitative data or otherwise aborts the results of quantitative research. The research concludes there is positive and significant relationship and it is strengthened by the results of qualitative research that: 1) There is positive significant correlation between organizational culture with OCB _ry1 = 0.234 (R²y1 = 11.2%) with the regression equation Y = 84,66+ 0,33 X1. 2). There is positive significant correlation between transformational leadership with OCB ry2 = 0.446 (R2 =19.8%) with the regression equation Y = 72,77 + 0,44 X₂. 3) There is positive significant correlation between personality with OCB ry3 = 0.659 (R² = 43.5%) with the regression equation Y = 46,36 + 0,70 X3. 4) There is positive significant correlation between organizational culture, transformational leadership, and personality together with OCB ry123 = 0,700 (R2y123 = 48.9%) with regression equation Y = 19,44+ 0,08 X₁ + 0,22 X₂ + 0,58 X₃. The quantitative research results are reinforced by the qualitative research.