As volunteer organizations cannot rely on instrumental means to motivate their workers, we examine organizational commitment as a focal indicator of work motivation among volunteers. Based on a social identity analysis and previous work among paid employees, we argue that pride in the organization and respect from the organization predicts organizational commitment among volunteers. We further propose that among volunteers the perceived importance of volunteer work is an antecedent of pride, and that perceived support from the organization is an antecedent of respect. In this study among volunteer workers, Structural Equation Modeling (SEM) offers empirical support for our hypothesized model. In addition to the theoretical significance of developing a model that explains organizational commitment among volunteer workers, this study also has practical relevance, as it indicates that volunteer organizations might convey the importance of volunteer work and provide organizational support to induce pride and respect as a means of enhancing organizational commitment among their volunteers. Copyright © 2007 John Wiley & Sons, Ltd.