The Environmental Information: Use and Influence research program is pleased to present the report of the workshop, Marine Information Matters: Probing Its Use and Influence in Policy and Decision Making, held on 20-21 September 2013, in collaboration with our governmental and non-governmental partners. The workshop report contains an overview of the public lecture by Dr. Richard Grainger, former Chief, Information and Statistics, Food and Agriculture Organization, and the report also describes the progress of work and the main findings of case studies completed under the EIUI-Partnership Grant. The workshop was held at Dalhousie University and was open to interested students and researchers on marine sciences and public policy and staff of governmental and non-governmental organizations.