The qualitative and quantitative analysis of the macrobenthic fauna of the tidal zone of Coleroom Estuary revealed an irregular pattern in the distribution and abundance. The polychaetes formed the predominant group among the fauna showed significant positive correlations with percentage composition of silt in the sediment. Gastropods and bivalves are the molluscs available along with the crustaceans, isopods and amphipods. No significant correlations were noticed between the number of the total fauna and the seasonal fluctuation in the environmental parameters.