At least three sharks die every second worldwide due to bycatch, targeted fishing and/or the destruction of their habitats. The Scalloped Hammerhead Shark (SHS, Sphyrna lewini) is among the most globally threatened shark species (listed as endangered in the IUCN Red List) and has recently being included in the Appendix II of CITES. The purpose of this study is to present empirical evidence of the existence of a SHS nursery in the Rewa Delta, Fiji. A total of 1217 captures (including 107 recaptures) were made from September 2014 to March 2016 by using gill nets. A total of 952 individuals (+ 102 recaptures) were captured during the field surveys and an additional total of 163 SHS were captured by local fishermen as by-catch (five of these 163 individuals were previously tagged during our study). According to the definition of a shark nursery area proposed by Heupel et al. (2007), our results unambiguously confirmed that the Rewa Delta is a nursery ground for scalloped hammerhead sharks because the following conditions were met: 1) the abundance of SHS is higher in the nursery ground than its surroundings, 2) there is site fidelity of SHS neonate and young of the year in the Rewa Delta and, 3) a long term presence of SHS in the Rewa Delta was observed. To the best of our knowledge, this is the largest and probably the most important nursery ground for the species ever documented in the tropical South Pacific Ocean.