The document summarizes the Marine Roadmap and Capability Study conducted in 2011/2012 to identify priority opportunities for the UK marine industries to focus on. The study was funded by the Technology Strategy Board and Transport KTN and involved workshops with industry, academia, and stakeholders. It identified 30 leading market opportunities within 4 major groups: integrated transport, marine renewables, low carbon/green shipping and propulsion, and marine ICT. The roadmap aims to inform the scope of the Vessel Efficiency Competition.