Activism is a critical point of contention for institutions and genealogies of contemporary art around the world. Yet artists have consistently engaged in activist discourse, lending their skills to social movements, and regularly participating in civil and social rights campaigns whilst simultaneously boycotting cultural institutions and exerting significant pressure on them. From ACT UP and its affiliate groups since the dawn of the AIDS crisis to the mediatised counterspectacle and street theatrics of the socalled Arab Spring and Occupy, to ongoing protest movements such as Black Lives Matter, Rhodes Must Fall and Decolonize This Place, activist aesthetics has proven increasingly difficult to define under traditional classifications. Resurgent campaigns for decolonial reckoning, ecological justice, gender equality, indigenous rights and antiracist pedagogies indicate that the role of activism in contemporary art practice urges a critical reassessment. One pressing question is whether contemporary art¿s most radical politics now takes place outside, against, or in spite of, conventional sites of display such as museums, biennials, and galleries. This volume addresses an extraordinary moment in debates over the institutional frameworks and networks of art including largescale direct actions, as well as a radical rethinking of art venues and urban spaces according to racial, class or genderbased disparities, including demonstrations against the extractive and exploitative practices of neoliberal accumulation and climate catastrophe.