This study addresses how questions of shared responsibility may arise in, and may be addressed by, international nature conservation law. The latter is understood to cover norms of public international law aimed at the conservation of wild flora and fauna (wildlife) and their habitats, the ecosystems they compose, and biological diversity at large. Situations are considered within this field of law where multiple actors – principally states – have contributed to a harmful outcome, and where questions have arisen, or could arise, concerning their shared responsibility for that contribution. The analysis clearly demonstrates the relevance of the shared responsibility concept to the field of international nature conservation law. This relevance may be expected to come increasingly to the fore, as the need for international cooperation keeps pace with the escalating biodiversity crisis it is intended to address. The analysis equally clearly illustrates the complexity of the questions arising from the challenging and multifaceted notion of shared responsibility.