A total of 195 Epinephelus coioides (Hamilton, 1822) were studied for fish parasites from Javanese (Segara Anakan lagoon) and Balinese waters. Up to 25 different parasite species belonging to the following taxa: one Ciliata, one Microsporea, five Digenea, one Monogenea, four Cestoda, four Nematoda, one Acanthocephala, one Hirudinea and seven Crustacea were identified with four new host and locality records. The dominant parasites included the monogenean Pseudorhabdosynochus lantauensis (53.3 -97.1%), the nematode Spirophilometra endangae (23.3 -42.9%), the digenean Didymodiclinus sp. (2.9 -40.0%), the nematodes Philometra sp. (22.6 -34.3%) and Raphidascaris sp. (2.9 -28.6%), and the isopod Alcirona sp. (6.7 -31.4%). Regional differences for E. coioides were found in terms of endoparasite diversity, total diversity according to ShannonWiener, Simpson index and Evenness. A comparison with published data from Sumatera revealed highest endoparasite diversity (Shannon -Wiener: 1.86/1.67-2.04) and lowest ectoparasite/endoparasite ratio (0.73/0.57 -0.88) off the Balinese coast, followed by Lampung Bay, Sumatera