After a theoretical analysis of the concept of organizational citizenship is elaborated, we complete an analysis of the characteristics of school organization that promote citizenship behaviors. We assume that the leadership of the principal is critical in such an endeavor as well as the trust that colleagues have in each other and the extent to which there is a school press for academic achievement. Using a sample of 75 middle schools, our hypotheses were supported; all of these factors both individually and collectively have positive influences on organizational citizenship. Finally, the implications of the findings are considered. (Contains 3 tables and 2 footnotes.)