Renewable energies are currently emerging as the most promising technologies for mitigating severe environmental impacts, contributing to the achievement of global sustainability goals. Offshore renewables, such as offshore wind and wave energy, are some of the most promising candidates for accomplishing environmental objectives, and this Reprint provides an updated overview of the progress in this area, as well as highlighting promising directions for future research. The Reprint includes a broad spectrum of themes, ranging from fundamental modeling and control strategies to hybrid wind-wave energy system design and long-term resource assessment.