For a country it is of great advantage to have a coastline since it serves a gateway to the worldwide oceans. Nature has not bestowed this advantage on all countries of the world but has endowed the coastal areas of Pakistan with abundant of marine resources. Seaweeds, being benthic, are primary producer of coastal ecosystem. They are inhabitants of the neritic zone in the marine hydrosphere, as majority of herbivores feed on them. They may serve as good source of food to mankind, animals and also as natural fertilizer for farm and agricultural land. Seaweeds have been used for medicinal purposes and their products are being employed in healthcare system. In the present Monograph, the authors have endeavoured to reveal the facts about the Econo- Medicinal Seaweed Resources of Pakistan, incorporating current information from a number of publications. This book practically describes the bioactivity tests and elemental composition of seaweeds of Pakistan. The monograph will inspire enthusiastic researchers to come forward and utilized them for the National benefit as well as aboard. The extensive updated references will be in valuable in a wide range of readers.