<p>Stable isotope analysis is a powerful tool to study the niche dynamics of organisms. We summarized the available literature on nitrogen (δ¹⁵N) and carbon (δ¹³C) isotope values of the muscle from seven hammerhead shark species (genus <i>Sphyrna</i>), six of which are listed as Vulnerable or higher conservation concern on the IUCN Red List. We aimed to reconstruct the isotopic niche and examine the levels of isotopic niche overlap using sample-sized weighted Monte Carlo Simulation. Our analysis revealed high levels of variation in the isotopic niches between-records, with niche partitioning among records and species predominantly occurring at a local scale, agreeing with previous research suggesting regional niche partitioning. As spatial scale widened, isotopic niches between-oceans and species tended to overlap, suggesting hammerhead sharks can exploit a broad spectrum of prey throughout the food chain and occupy habitats with diverse carbon sources. Conservation implications include that: (1) hammerhead sharks exhibit flexibility in prey choice, making them less vulnerable to bottom-up trophic cascade; (2) nearshore habitats likely serve as crucial sources for their prey; (3) higher conservation priority should be given to <i>Sphyrna mokarran</i> for its preference of nearshore habitats and large size, and (4) diverse conservation strategies among hammerhead shark species are needed to address distinct niche-driven vulnerabilities at finer spatial scales. We highlighted research gaps of unbalance in species (favoring <i>S. lewini</i>), oceans and regions (a majority from the East Pacific), specimen sizes, and tissue types (mostly the muscle tissues from the juveniles), which may serve as a valuable roadmap for future studies.</p>