Marine spatial planning (MSP) is a tool for managing and improving marine environments. The field is dominated by natural scientists and has not been commonly associated with planning. This research analyzes the MSP literature to explore how planners can contribute to MSP research and practice. We organize the literature into eight themes, focusing on how planners may be able to contribute to MSP research and practice: ocean zoning, defining boundaries, planning in dynamic environments, stakeholder involvement, information needs, integrating ocean and land-use management, managing multiple and conflicting uses, and transboundary institutional structures. We conclude that planners have a lot to contribute in these eight areas.