Traditional studies of teacher commitment often ignore the effect of interactions between personal characteristics and school environment and the implications of their findings are inevitably limited. Responding to this research gap, the present study aims to investigate the contingency relationship of school organizational health to teacher commitment with multi-level statistical analysis. The study was a survey involving 20 aided primary schools and 423 teachers in Hong Kong. The findings suggest that three school organizational health factors such as morale, consideration and institutional integrity are related to teacher commitment through interactions with the teacher personal characteristics such as position, marital status, and length of service in the school. The result supports that the relationship between school organizational health and teacher commitment is contingent upon teacher characteristics. The interesting findings can provide implications for school improvement and future research. [Copyright of Educational Research & Evaluation is the property of Routledge. Full article may be available at the publisher's website: http://dx.doi.org/10.1076/edre.5.3.249.3883]