This paper examines the relationship between stressful working conditions and union members’ dissatisfaction with their union. Few studies to date have examined this relationship and existing studies report contradictory findings. That is, some studies find that stressful work is associated with satisfaction with the union while other studies find either no relationship or that stressful work is associated with dissatisfaction with the union. Data were collected from 992 postal workers in Edmonton in 1983. Results suggest that the more stressful working conditions are, either objectively or subjectively, the more likely union members are to be critical of and/or dissatisfied with their union.