This dataset consists of marine habitat information on the South Irish Sea. The habitats are classified according to the European Nature Information System (EUNIS). The EUNIS habitat classification is a comprehensive pan-European system to facilitate the harmonised description and collection of data across Europe through the use of criteria for habitat identification. It is hierarchical and covers all types of habitat types from natural to artificial, from terrestrial to freshwater and marine. Habitats coverage is of the South Irish Sea. Data was acquired between 2007-2010. Marine habitats data created from the interpretation of multibeam echosounder backscatter and bathymetric data. The data was acquired by Ireland’s national seabed mapping programme (INFOMAR - Integrated Management for the Sustainable Development of Ireland’s Marine Resource). Data acquired to support maritime spatial planning. Data acquired and interpreted by the Advanced Mapping Services team within Ocean Science and Information Services section of the Marine Institute (Ireland). Data completed for INFOMAR survey coverage area.