The Implementing Agreement on Ocean Energy Systems (IEA-OES) has a mission of facilitating and coordinating research, development and demonstration through international co-operation and information exchange, leading to the deployment and commercialisation of sustainable, efficient, reliable, costcompetitive and environmentally sound ocean energy technologies for harnessing all forms of ocean renewable energy resources, such as, tides, waves, currents, thermal gradients, and salinity gradient, to generate electricity as well as for other utilizations. This paper presents the current and future international collaborative activities to enable deployment of ocean energy technologies worldwide.