This study draws on a general framework of proactive motivation to propose and test a model that evaluates the influence of the individualized consideration dimension of transformational leadership and organizational climate on change-oriented organizational citizenship behavior. In this model, individuals' cognitive emotional states (role breadth self-efficacy and felt responsibility for constructive change) act as mediating variables. For the first time in the literature, this paper develops a model of leadership and organizational climate antecedents of organizational citizenship behavior. Using a sample of 602 Spanish employees with higher education, the structural equation modeling indicates that the proposed model fits reasonably well to the data. Research results show that all hypotheses are significant, thus confirming the results of previous research that finds mediated relations between transformational leadership and other dimensions of organizational citizenship behavior.