Posthuman Intersections in Irish and Galician Literatures identifies how contemporary production in both literary fields explores the synergies between the human and the more-than-human worlds —human and nonhuman animals, the organic and inorganic environment, machinery and modern technologies. The frame of Posthuman Studies guides the essays of this volume in their interrogation of anthropocentrism and identification of shared agency. The comparative approach to the literary production in Galicia and Ireland —justified by the longstanding sociocultural bonds between both Atlantic communities— reinforces the posthuman notion of connectedness at a time in which the environmental crisis calls attention not only to the local but also to the transnational and global. The peripherality and history of subalternity of both communities with respect to neighbouring nation-states enter into dialogue with the posthumanist challenge to centrality and universality. The essays in this volume identify those aspects which, raised by one community, are of relevance— even if suppressed, diverted or sublimated— to the other, and show how current posthumanist concerns are producing the most audacious literary work.