The gathering of volunteers at incident sites is a well-known phenomenon within disaster research. Voluntary actors may be included in different ways and to different degrees in official disaster response operations. In the present study, practices of inclusion of different types of volunteers in the response to a large-scale forest fire in Sweden are studied. Semi-structured interviews were conducted with three types of voluntary actors. The volunteers were organized to different degrees, from members of organizations and participants in emergent groups to organizationally unaffiliated individuals. Organized volunteers were the most easily included, particularly if they were members of voluntary emergency organizations. It was difficult for volunteers lacking relevant organizational affiliation to be included. However, disaster response operations are dynamic, conditions change over time, and tensions between different modes, degrees, and levels of inclusion may arise.