Raigad coast line of konkan are plentiful natural resources like marine algae, colourful fishes, various crabs ,beautiful corals, marine mammals, sea grasses and various organisms. It shows various types of marine algae like caulerpa, ulva, chaetomorpha, sargassium, gracilaria, gelidiopisis, hypna, codium ,stoechospermum, padina, cladophora, enteromorpha, porphyra, jania rubens etc. found in large quantity. Biodiversity of macro marine algae plays an important role as a source of food, feed, fodder, fertilizer and medicines throughout the world, since ancient times .Raigad coast line shows various types of chlorophyta, phaeophyta, and rhodophyta. In this investigation total 45 species were found, out of that 13 species belonging to green algae, 14 species belonging to brown algae and 18 species belonging to red algae. The 44 algal species belonging to 34 Genera and distributed in 24 different families. Macro Marine algal species like green algae, brown algae, and red algae found abundantly at coast line of Raigad of konkan, Maharashtra.