In response to a petition submitted by WildEarth Guardians and Friends of Animals, we, NMFS, are issuing a final determination to list the Central and Southwest (SW) Atlantic Distinct Population Segment (DPS) and the Indo-West Pacific DPS of scalloped hammerhead shark (Sphyrna lewini) as threatened species under the Endangered Species Act (ESA). We are also issuing a final determination to list the Eastern Atlantic DPS and Eastern Pacific DPS of scalloped hammerhead sharks as endangered species under the ESA. We intend to consider critical habitat for the Central & SW Atlantic, Indo-West Pacific, and Eastern Pacific DPSs in a separate rulemaking.