The term “identity fields” merges two influential social movement concepts: movement framing processes and collective identities. A fundamental and ubiquitous aspect of social movement framing processes involves the avowal and imputation of characteristics relevant to at least three generic sets of actors within the multiorganizational field that comprises a particular social movement arena: protagonists, antagonists, and audiences. Hunt, Benford, and Snow refer to the clustering of these socially constructed movement actor categories as identity fields. Identity fields are constructed throughout the life course of a social movement as its participants identify a problem and attribute blame or causality, as they seek to mobilize support for their cause by employing various frame alignment strategies, as they respond to criticisms and other attacks from countermovements, the media, and targets of change, and as they talk with one another to reflect on and redefine movement successes and failures.