The Routledge Companion to Art Biennials assembles forty-six chapters that explore art biennials as expanded sites of artistic display, cultural policy, economic value, soft power, urban development and political struggle. The volume traces biennials from their 19th-century origins to their explosive post-Cold War growth, critically engaging with debates on globalization, institutional critique, identity, inclusion and resistance. Structured in eight parts, it maps biennial histories from Venice to São Paulo and beyond, alongside their geopolitical and institutional entanglements. Bringing together contributors from diverse disciplinary backgrounds, the volume offers a comprehensive account of art biennials in their complexity and ambiguity, while outlining the main orientations and state of research in the field of biennial studies. The volume will appeal to scholars and students in art history, museum and curatorial studies, as well as cultural geography, cultural sociology, critical theory, public sphere studies, media and communication studies, postcolonial theory, anthropology and cultural and creative industries, making it essential for examining contemporary art and visual culture’s institutional ecosystems.