Marine worms play an important role in the environment in marine food chains such as prey, predators, filter feeders, or scavengers and are similarly important to aquatic bioturbators as deposit feeders. Diversity of Marine worms has been studied during December-2019 to December-2020 in the intertidal zone of Gir somnath district of Gujarat state some part like Vadodara dodiya (20097’ 82”62 N, 70025’29”11 E), Aadri (20095’ 91”96 N, 70027’95”85 E), Navapara (20094’ 45”80 N, 70030’10”86 E) and Dari (20093’ 60”26 N, 70031’21”99 E) coast. The field Study was done during Lowtide. Total of 13 species from 7 families were recorded during the field Study. Eulalia viridis was found to be highly abundant. Navapara site had highest species Diversity in comparison to other sites. Water quality parameters like Temperature, pH, Salinity and Total Dissolved Solid (TDS) showed in normal range during study period. To assess the difference between the studies sites, specific diversity indices were used.