The terms “activist” or “socially engaged” art (used interchangeably throughout this article) refer to artistic practices that are integrated with, or responsive to, forms of political protest and resistance. This typically entails some connection to a social or political movement, community, or group that is seeking to challenge an authoritarian regime or contest hegemonic forms of domination, often associated with differences of class, race, ethnicity, or sexuality. The form taken by activist art can range from relatively abbreviated performative gestures to extended engagements with institutional power structures, to modes of symbolic or discursive production circulating in the public sphere (murals, graphic art, etc.). In each case, however, we can observe a reciprocal relationship between artistic production and mechanisms of social and political transformation oriented toward human emancipation. Between the mid-19th and mid-20th centuries there were significant interconnections between the concept of an activist art practice and the modern avant-garde. I’ll provide a brief outline of some of these navigational points in the section Historical Studies. It’s not possible, however, to provide a comprehensive account of sources across this broader historical range. For the purposes of this article, I will focus primarily on work since the 1960s, when we can observe the initial expression of a recognizably contemporary set of referents for activist or engaged art practice. Even within this limited time frame, the range of possible material far exceeds the space necessary to acknowledge relevant sources. Activist art practices, by their very nature, tend to overlap with, and ramify into, a range of adjacent forms of cultural production. We can find meaningful connections to activist theater (Augusto Boal), radical pedagogy (Paolo Freire), the Art and Labor movement, the traditions of community and street art, digital activism, tactical media, activist filmmaking, and urban murals, among many other relevant sources. Moreover, there are distinctive manifestations of activist or engaged art in every region of the globe. Argentine activist practice has its own unique traditions and concerns, as does art produced in Eastern Europe, South Africa, India, Japan, and Mexico. Rather than attempting to fully address each of these areas, I will offer a series of chronological divisions that chart some of the shifts that have occurred in the production of activist art since the mid-20th century.