Isfaeni H, Fadliansyah M, Prakoso YA. 2020. Hard coral community structure in Peucang Island Ujung Kulon National Park. Pros Sem Nas Masy Biodiv Indon 6: 537-541. Indonesia is an archipelago country with very high biodiversity, but not all of its potentials can be identified, one of which is Peucang Island in Ujung Kulon National Park. This research was conducted on September 17-19, 2018 in the waters of Peucang Island, Ujung Kulon National Park, Banten. The method used is descriptive method. The study was conducted at 2 stations with 4 transects each along 50 meters, with community structure including diversity, uniformity, relative abundance, and total dominance. Based on the results of the study found 232 samples with 14 species dominated by Acropora branching type corals, moderate diversity at both stations, low uniformity under pressure, moderate dominance at station 1 and low at station 2, and highest abundance at branching type Acropora types at both station.