Foraminifera and Ostracods are regarded as ideal indices of marine pollution investigations. During spring 2017, we investigated benthic assemblage of Foraminifera and Ostracods along the Gilan province in the southern shoreline of Caspian Sea, Iran as a pioneer study throughout the country. The sampling stations were selected to cover the shoreline both extremes as well as middle parts. Different physio-chemical properties like salinity, pH, carbonate content, sediment particle size and peculiarities were measured in the pre-defined sampling sites. Our findings show that Foraminifera and Ostracods abundance negatively dependent to the sediment particles' size while positively correlated with water carbonate content. Other macro faunal communities positively increased in their abundance where the sediment particles size show increasing trend.