The goal of this study was to explore the mediating role of 'absenteeism acceptance' between different leadership styles and school ethical climate (SEC) on organizational citizenship behaviors (OCB) and voluntary absence among Israeli teachers. 304 teachers were randomly selected from 304 different mainstream and special-education schools. The model was analyzed using AMOS 18.0 software. We found that 'absenteeism acceptance' partially mediated the relationship between transactional leadership, SEC and OCB, and also found that SEC and transactional leadership positively predict OCB. The theoretical contribution of this study is rooted in its integrative approach. While most previous studies focused on a single leadership style, this study focused on the role of 'absenteeism acceptance' as a mediator between ethical aspects such as: SEC; leadership styles; and teachers' behaviors like voluntary absence and OCB. The practical contribution may include developing school principals' training programs, focusing on transactional leadership and SEC in order to increase teachers' OCB in schools.