The mangrove diversity was studied from whole Karnataka, Southwest coast of India, for a period of two years from Sep.-2015 to Nov -2017 to documents the species of true mangroves and mangrove associates. The variation in the diversity of mangroves and mangrove associates is seen from place to place due to climate, tidal factors and anthropogenic pressures. Total 16 species of true mangroves were recorded belonging to 11 genera and 7 families. There are mangrove associates comprising 12 species belonging to 12 genera and 10 families. The distribution of Mangroves and mangrove associates has been discussed in the paper.