How might law address the multiple crises of meaning intrinsic to global crises of climate, poverty, mass displacements, ecological breakdown, species extinctions and technological developments that increasingly complicate the very notion of 'life' itself? How can law embrace - in other words -the 'posthuman' condition - a condition in which non-human forces such as climate change and Covid-19 signal the impossibility of clinging to the existing imaginaries of Western legal systems and international law? This carefully curated book addresses these and related questions, bringing 'law beyond the human' (drawing on Indigenous legalities, life ways and ontologies) and New Materialist and Posthuman/ist approaches into stimulating proximity to each other. Bold and astute, it draws an invigorating and lively mix of participants into its conversation: soils, urban animals, rivers, rights, Indigenous legalities, property as habitat, swarms, 'unusual posthuman capacities', decolonial critiques, eco-feedback, arts, affective encounters and more besides. Ultimately, this pivotal work shows how law currently fails to respond to the challenges and realities it faces, while demonstrating that law can also be a co-emergence of 'something else', more responsive, relational and prefigurative. Lively and engaging, Posthuman Legalities will prove an imperative read for students and scholars with a keen interest in breaking down barriers to address emerging challenges in environmental law, climate law, and human rights law, in conversation with new approaches to planetary justice.