A recent article brought together the health benefits of unionization and working under collective agreements. It was noted how Canadian health promotion texts, reports and statements made no mention of unionization and working under collective agreements as promoting health. This was seen as a significant omission and reasons for this were considered. In this article this analysis is extended to consider how contributors to the flagship health promotion journal Health Promotion International (HPI) conceptualize unions, unionization and working under collective agreements as promoting health. Of 2443 articles published in HPI since its inception, 87 or 3.6% make mention of unions, unionization, collective agreements or collective bargaining, with most saying little about their promoting health. Instead, 20 make cursory references to unions or merely see them as providing support and engagement opportunities for individuals. Forty-five depict unions or union members as involved in a health promotion programme or activity carried out by the authors or by government agencies. Only 33 articles explicitly mention unions, unionization or collective agreements as potentially health promoting, representing 1.3% of total HPI content since 1986. We conclude that the health promoting possibilities of unionization and working under collective agreements is a neglected area amongst HPI contributors. Reasons for this are explored and an Organisation for Economic Cooperation and Development report on the importance of collective bargaining is drawn upon to identify areas for health promotion research and action.