Environmental law remains grounded in a ‘one-world world’ paradigm. This ontological structure asserts that, regardless of variation in world-construing, all beings occupy one ‘real’ world of discrete entities. The resulting legal system is viewed as an independent set of norms and procedures regulating the ‘human’ use of the ‘environment’ by specifying allowable harm rather than adjudicating on mutually enhancing relations. This legal form fails to fulfil its purpose of prevention and remediation, and constitutes a significant barrier to overcoming world(s)-destroying conditions. As such, we take up the injunction for a ‘legal ontological turn’ so as to lay bare these assumptions, and to be able to move beyond their constraints into a renewed exploration at the intersection of vastly differing legalities. In dialogue with systems-grounded ecological jurisprudence(s), Indigenous legal thinking, and anthropological insight, we seek to ground future discussions towards building a truly earth-sustaining form of environmental law for all beings.