This article continues the conceptual work of developing a process-oriented perspective on belonging by taking up the active engagement of affiliation (and disaffiliation) as an undertheorised yet necessary aspect of accomplishing belonging. In developing the concept we draw on Marx’s notion of work as material activity in forms of life and the sociological concepts of face-work and emotion work. We conceptualise belonging work as relational work concerned with shaping situational interactions; webs of relationships; social boundaries; and materials and rhythms as dimensions of belonging. This work is conditioned by social categorisations and patterns of inclusion and exclusion through which it takes place in relation to specific forms of life. The concept of belonging work offers a theoretically integrative and sensitising concept that highlights the relational dynamics of belonging, providing insight and inspiration to social researchers inquiring into the work of belonging and its associated social consequences throughout the research process.