Book excerpt: Building Ocean Science Partnerships describes a set of potential ocean science projects for cooperative research between scientists from the United States and Mexico, particularly focused on the Pacific Coast of California and Baja California, the Gulf of California, and the Gulf of Mexico. Barriers to cooperation between scientists of the two nations are identified, and methods to overcome such barriers are recommended. The book describes how interactions can be promoted by enhancing opportunities for education and training, building and sharing scientific infrastructure, participating together in large-scale marine research programs and regional ocean observing systems, planning joint science events and publications, and developing sources of binational funding. Building Ocean Science Partnerships will be published in English and Spanish to make its contents widely accessible in the United States and Mexico.