Development of wave and offshore wind-based marine renewable energy is anticipated on the Outer Continental Shelf (OCS) off Oregon and much of the Pacific Northwest in the coming decade. Multiple issues related to environmental considerations and information needs remain for these emerging industries. The Oregon Marine Renewable Energy Environmental Science Conference was held 28-29 November 2012, at Oregon State University (OSU) in Corvallis, Oregon. The conference brought together experts to outline research and monitoring needs to assess environmental impacts of these technologies. The conference was organized via a partnership between the Bureau of Ocean Energy Management (BOEM) and several entities within the state of Oregon. The primary goal of the conference was to evaluate environmental research needs associated with wave and offshore wind energy development in the Pacific Northwest. The conference had three major objectives: i) showcase research recently completed or currently underway that addresses environmental questions associated with marine renewable energy; ii) synthesize new research and existing information with the aim of distilling it into products that agencies and resource managers could use to carry out their planning and management duties; and iii) identify gaps in our understanding of the technologies and potentially affected systems useful to scientists, managers and funders to determine where to focus future research efforts.