Over 60% of human activities in the west coast of Peninsular Malaysia are concentrated in the coastal areas. High human activities in the coastal areas may cause hazardous chemical pollution. In this report, intertidal molluscs were used to assess heavy metals pollution in the coastal areas of the west coast of Peninsular Malaysia. Intertidal gastropods such as Thais, Cherithedia and Nerita, and bivalves such as Anadara, Isognomon alatus and Perna viridis have been studied and analysed for their suitability as biomonitoring agents. These species are abundant in the intertidal areas of the west coast of Peninsular Malaysia and represent different groups of habitat, behaviour, physiology and feeding habit. Perna viridis and Isognomon alatus are good indicators for heavy metals pollution, and Perna viridis and Thais are good ones for organotins pollution, because they are easily available and analysed, and also able to reflect the quality of the environment. These molluscs can help in the monitoring and management of heavy metals in the coastal ecosystem.