Northern Red Sea coastal basins in Saudi Arabia are under favorable background conditions for geological CO2storage, such as proximity to major CO2emissions, favorable geothermal regime and seismicity. This study assesses CO2storage potential in four major basins, including the Midyan, Ummluj, Yanbu and Jeddah basins. We identified major potential sites, using all the available data, including subsurface data, outcrops, potential field and satellite images. We ranked major potential sites, based on containment system security, storage capacity and proximity to CO2emissions. Results show that the basins have a total effective storage capacity of c. 6500 Mt (P50value), which is high enough to store targeted nearby stationary CO2emissions (c. 115 Mt/yr) for c. 60 years. Aquifers with closed structure or a regional seal are locally present that are the most attractive for CO2storage, due to their high containment security. However, most of the sites have heterogeneous dipping aquifers without regional seal, which will rely on the migration-assisted trapping to contain safely downdip injected CO2. Detailed geological modelling and reservoir simulation in the future are essential for conforming the storage potential in these unsealed aquifers.