Mangrove forests cover 137,600 km2 of coastline in 118 countries with 38.7% in Asia including Indonesia. The purpose of this study was to analyze the diversity, characteristics, threatening rate, and potency of mangrove plants found in the mangrove forest area of Denpasar City, Bali. Monitoring activities on mangrove vegetation has great importance for the balance of ecosystems and the livelihoods of people living around the mangrove area. Vegetation data were collected using systematic sampling. This method is based on the assumption that the number of individual plants per unit area can be calculated as the average distance between the plants. The data obtained is then analyzed based on the parameters of Characteristics, Frequency, Density, Dominance, Relative Frequency, Relative Density, Relative Dominance, Important Value, and Index Diversity. The results showed that there were 12 plant species that were identified, and 35% of species were categorized as "true mangrove" species. Denpasar's mangrove forests are dominated by Soneratia alba with an Important Value Index of 157% and secondly, species is Rhizophora mucronota by 52%. The diversity index (H') is 0.65, which shows that the diversity of vegetation in the mangrove area of Denpasar is homogeneous. There are 2 mangrove species that need further monitoring based on IUCN Red list data, namely Thespesia populnea and Ceriops decandra. Thus, efforts are still needed to protect and restore the mangrove ecosystem, especially for species that have the potential that can be developed as sustainable products and ecotourism areas in the city of Denpasar.