Understanding aspects of maritime/underwater cultural heritage (MUCH) and the associated cultural values and integrating them into maritime spatial planning (MSP) processes is a new global challenge alongside the rapid increase in human activities at sea and climate change impacts on the seas and the oceans. This article highlights the significance of cultural values in shaping human interactions with marine environments and how MSP can address the cultural dimensions of marine resources management. The key research question addresses the prerequisites and methods for a better incorporation of MUCH in the MSP processes. This review revealed a diversity of literature addressing the inclusion of MUCH in (a) coastal and marine management but also in (b) marine/maritime spatial planning (346 articles from the Scopus database). In the first case, there is a strong focus on cultural ecosystem services (CES) and cultural values, the role of indigenous and local communities, the transfer of traditional ecological knowledge, and participatory approaches and tools. As for the latter, this review demonstrated quite a lot of relatively recent MSP endeavors that seem to be influenced by the above approaches identified in the coastal and marine management literature. This article concludes that for MSPlans to be innovative and mainly acceptable by local communities, the “missing layer” of socio-cultural values and data is indispensable. Furthermore, a collaborative MSP between governments and regional/provincial authorities may boost sustainable blue activities while preserving ecological and cultural values.