Migratory shark and ray populations are declining globally, yet the movement patterns and habitat use of most species are unknown. Despite increasing efforts to track these taxa, information on movement across jurisdictions is often not readily accessible to managers and policymakers. Here, we synthesised movement information from published studies for Australian species listed under the Convention on Migratory Species (CMS), to assess which species have movement data available and to identify those requiring international engagement to support population recovery. We built connectivity networks from telemetry and mark-recapture studies that provide a first transboundary connectivity baseline for Australian sharks and rays. Of the 29 CMS-listed shark and ray species reviewed, we identified 5 species linking the Australian Exclusive Economic Zone to other national jurisdictions via migratory connections through the Tasman Sea to New Zealand, through the Tasman and Coral Sea to New Caledonia, and north across the Timor Sea and Torres Strait. White sharks Carcharhinus carcharias and whale sharks Rhincodon typus were the most data rich, while 18 species (62%) had no movement information. Overall, we found 64 studies for only 12 species, indicating that conservation and management of only a few CMS-listed sharks and rays can be informed by our understanding of their movement. These results underscore the need for expanded, multilateral, species-specific satellite telemetry programs. Of note, nearly two-thirds of Endangered or Critically Endangered migratory shark and rays had only one or no published studies. We also show the applicability of this synthesis to support (or not) listing of migratory species under CMS. This work demonstrates that migratory connectivity baselines can support international reporting, direct international collaboration, and focus research efforts on critical knowledge gaps.