Purpose: The purpose of this paper is to operationalize theories of social learning and collective action for campus sustainability practitioners at higher education institutions (IHEs) to enhance their work, and to introduce the concept of collective action competence as a practical tool. Design/methodology/approach: This paper presents a theoretical argument based on the concepts of learning and collective action for stronger consideration of social learning, action competence and voluntary collective action in campus sustainability initiatives. Findings: Many important sustainability outcomes depend heavily on voluntary behaviors by groups of campus stakeholders, making voluntary collective action an important, although underused, tool for campus sustainability practitioners. The term "collective action competence" is introduced and defined as the capability of a group of people to direct their behavior toward a common goal based on a collective literacy, a collective competence, and a collective need or goal. Originality/value: The term "collective action competence" is introduced as a novel unifying concept that articulates a critical capability needed for collective behavior change in social settings such as HEIs. Collective action competence is based on the theories of collective action and of social and free-choice learning and on the concepts of action competence and strategic competence.