The oceans cover approximately 71% of the Earth’s surface and contain more than 97% of the planet’s water, representing over 100 times more liveable volume than the terrestrial habitat. Approximately fifty percent of the species on the planet occupy this ocean biome, much of which remains unexplored. The health and sustainability of the oceans are threatened by a combination of pressures associated with climate change and the ever-increasing demands we place on them for food, recreation, trade, energy and minerals. The biggest threat, however, is the pace of change to the oceans, e.g., ocean acidification, which is unprecedented in human history. Consequently, there has never been a greater need for the rapid and widespread dissemination of the outcomes of research aimed at improving our understanding of how the oceans work and solutions to their sustainable use. It is our hope that this new online, open-access Journal of Marine Science and Engineering will go some way to fulfilling this need.