This study positions perceived organizational culture's (OC) as an important internal contextual factor that influences employee reactions to change. Drawing on the theory of planned behavior (TPB) and organization theory research, we analyze the mechanisms through which employee perceptions of OC generate its effect on employee responses to organizational change. Data from a field study of 171 employees in Kurdistan Region of Iraq's public school teachers showed that employee perceptions of developmental culture were positively and directly related to their change-supportive intentions (CSIs) and, as suggested by the TPB, its effects are simultaneously mediated by change-related attitude (CRA), subjective norm and perceived behavioral control. However, our findings demonstrated that hierarchical culture was only indirectly related to employee CSIs; this relationship was mediated only by CRA and subjective norm. This study is important because it broadens the remit of OC's role as change agent and provides valuable insight into how OC influences employee responses to change efforts in public organizations.