The endemic Australian freshwater crayfish genus Euastacus is considered one of the most threatened genus of freshwater crayfish in the world, with its members facing an uncertain future. In providing an up-to-date conservation assessment, this Action Plan affirms the threatened status of the bushfire-impacted priority species of Euastacus. In total, five species were assessed as Critically Endangered and 13 species as Endangered (with conservation assessment not currently possible for three of the priority species). Importantly, this up-to-date assessment outlined in this Action Plan is contributing to the proposed formal listing of 17 species of Euastacus under the Australian Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act). To assist with management and conservation, the Action Plan compiles existing knowledge on taxonomy, conservation status, description, cultural significance, distribution and habitat, biology and ecology as well as threats, conservation priorities and knowledge gaps for each priority Euastacus. Furthermore, the Action Plan outlines nine priorities for the conservation and management of bushfire-impacted priority species of Euastacus, which are equally relevant to all members of the genus. The priorities are to: It is hoped that this Action Plan will establish a platform for the genus-level conservation and management species of Euastacus, which are a critically important and vulnerable component of Australia’s distinctive inland aquatic biodiversity. • Undertake formal national assessment for all Euastacus and develop recovery plan(s); • Mitigate threats and implement conservation actions; • Incorporate and include Euastacus into management strategies and actions at multiple scales; • Define species’ range boundaries and implement ongoing population monitoring programs; • Resolve taxonomic uncertainty and formally describe putative species; • Redress previously identified critical biological and ecological knowledge gaps; • Explore species-specific conservation translocations; • Engage stakeholders in management and conservation; and • Raise the profile of the Euastacus within governments, NGOs and funding bodies.