<p>Technologies to harvest marine renewable energies (MREs) are at a pre-commercial stage and significant R&amp;D progress is still required in order to improve their competitiveness. Therefore hybridization presents a significant potential as it fosters synergies among the different harvesting technologies and resources. In the scope of this Special Issue hybridization is understood in three different manners: (i) combination of technologies to harvest different MREs (e.g. wave energy converters combined with wind turbines); (ii) combination of different working principles to harvest the same resource (e.g. oscillating water column with an overtopping device to harvest wave energy); or (iii) integration of harvesting technologies in multifunctional platforms and structures (e.g. integration of wave energy converters in breakwaters). This Special Issue presents cutting-edge research on the development and testing of hybrid technologies for harvesting MREs and intends to inform interested readers on the most recent advances in this key topic.</p>