Contamination of water resources with heavy metals has become a global environmental challenge. Heavy metals are released into water mainly through different industries and could pose a severe threat to humans. For the past 15 years, chromium is a heavy metal that has been recognized as one of the top 20 pollutants. Chromium can be present in various oxidation states in the environment however, the most stable states are trivalent Cr (III) and hexavalent Cr (VI), with hexavalent chromium being five hundred times more toxic than trivalent chromium. Because of their high toxicity to marine and human health, removing hexavalent chromium from polluted water sources is critical. Iron nanoparticles (FeNPs) have been used extensively in recent years in a range of water treatment and remediation applications due to their unique physiochemical properties. FeNPs have been synthesized using a variety of chemical and physical methods. However, researchers have been investigating more eco-friendly approaches for synthesizing iron nanoparticles while retaining their remediation ability. Iron Sulfide nanoparticles (FeS-NP) are a group of iron nanomaterials with special interest and green synthesis of FeS-NP from date seed extract in our labs have been reported successfully (ds-FeS). The aim of this study is to evaluate the removal efficiency of hexavalent chromium from water using green synthesized iron sulfide nanoparticles prepared from date seed extracts (ds-FeS). Detailed characterization techniques revealed the formation of spherical ds-FeS nanoparticles with a size range 40-100 nm (mean size of 68 nm) with a few particles (<5) being larger than 200 nm and surface area of 51 m2/g, while elemental mapping and XRD analysis confirmed the formation of FeS nanoparticles.