AbstractThis research examined the prevalence and intensity rate of ectoparasites that infected mangrove crab (Scyllasp.) at crab aquaculture area in Banda Aceh City, Indonesia. The study was conducted at three soft shell mangrove crab aquaculture in three different areas. Purposive sampling method was used within three aquaculture sites at Cot Langkeuweh, Gampoeng Blang, and Lamjabat village. The targeted organ was carapace, walk and swim leg and gill. Results showed that there were five parasites found from three family such asZoothamnium sp. Vorticella sp., and Epistylis sp. Octolasmis sp., andCopepoda sp.The highest prevalence rate wasEpistylis sp. with value of 50-60% whereas the lowest prevalence wasZoothamnium sp. andOctolasmis sp.with its value of 20%. The highest intensity level wasOctolasmis sp., andZoothamniumsp. with value of 8-11.3 ind/species, whereas the lowest intensity wasCopepoda sp. with value of 2 ind/species.