Abstract This study contributes to our understanding of the mediating and moderating processes through which satisfaction with developmental human resources practices are linked with organizational citizenship behaviour. Our model posits that the effect of satisfaction with developmental human resources practices on organizational citizenship behaviour is mediated by perceived organizational support and is moderated by job breadth. The methodology consisted of collecting data from 331 nurses who were surveyed about their satisfaction with developmental human resources practices, perceived organizational support, organizational citizenship behaviours and job breadth. Results support this model.