Joint study with the Union of Biodiversity Organizations on the marine invertebrates of Bigeumdo (Is.), Sinan-gun, Jeollanam-do was conducted over 3 sessions between March and September of 2011. Compared to the 2nd National Natural Environment Survey of 2000 (Ministry of Environment), 28 new species, including 10 mollusk species, were additionally observed, for a total of 71 marine invertebrates species belonging to 43 families. A list of 117 species belonging to 58 families, which includes the 71 marine invertebrates species observed during the study and the 88 species reported in the 2nd National Natural Environment Survey, was used to create an inventory of marine invertebrates studied in Bigeumdo (Is.), Sinan-gun, Jeollanam-do.