ODYSEA: Ocean dynamics as driver of seasonal to decadal European atmospheric variability is a NERC funded research project (NE/M006107/1) investigating the impact of the ocean on the variability and predictability of European weather and climate. ODYSEA combines novel and existing numerical simulations (including hindcasts from the latest generation of the UK Met Office’s seasonal and decadal forecasting systems) and observations to provide new process-level understanding for European atmospheric variability by identifying the physical mechanisms through which the ocean modulates the variability of European climate. The project began in 2015.