This report provides an initial assessment of Ireland’s current measurement programmes and capacity for Essential Ocean Variables (EOV) data collection. These are typically programmes that involve physical sampling of the marine environment, using a combination of ship-based measurements, fixed platforms e.g. tide and wave gauges, offshore buoys, autonomous platforms e.g. underwater gliders, and conventional collection of physical samples that are analysed on board ships or in shore-based laboratories. Systematic measurement of essential ocean variables underpins the delivery of services to government and the public in terms of real-time decision support, assessments of ocean health e.g. Marine Strategy Framework Directive (MSFD), Oslo & Paris Conventions (OSPAR), International Council on the Exploration of the Sea (ICES) and long-term observations to inform policy on marine climate change and provide climate information to guide related adaptation measures required under climate change sectoral adaptation plans e.g. seafood sector, transport, biodiversity, and built heritage.