The coastal zones of eastern China have been experiencing rapid industrialization and urbanization over the past decades. In these coastal zones, population and economic activities as well as demand for resources have increased significantly over the years. Identification, classification, and mapping of coastal ecosystem services provide the basis for reasonable use of coastal natural resources, solving the conflicts between coastal development and conservation. However, the existing classification systems of ecosystems services reported in literature are not suitable for application in coastal areas. Based on previous research, we developed a general framework for identifying and classifying coastal ecosystem services in the highly urbanized and industrialized Guangdong, Hong Kong, and Macao Great Bay Area. The framework is divided into four levels based on whether the ecosystem services are provided by biota or not, with the first level including provisioning services, regulating services, and cultural services. The ecosystems of this area are divided into coastal water, transitional water, terrestrial ecosystems, and freshwater, which are defined in the framework. Big data derived from maps and land use data derived from remotely sensed images served as the basis for mapping the identified ecosystem services in the framework. In this study, we identified 35 coastal ecosystem services and mapped 31 of them based on data availability. The results showed that the methodology built in this study can systematically identify the characteristics and spatial distributions of ecosystem services in the Guangdong, Hong Kong, and Macao Great Bay Area. In particular, provisioning services and cultural services are concentrated in the central urban areas of the study region, while regulating services are aggregated in the urban outskirts. According to the overlay analysis of all mapped ecosystem service types, we assigned the study area into three main functional zones for providing ecosystem services:(i) cultural service zone that distributes in the central urban area, and cultural entertainment service is the main service type in this zone; (ii) provisioning service zone that distributes in the outskirts of the cultural service zone and provides food and materials for human beings; (iii) regulating service zone that distributes in the border of the study area and mainly regulates the urban environment. In conclusion, the methodology for identifying, classifying, and mapping coastal ecosystem services built in this study is practical, and can provide scientific reference for coastal ecosystem conservation, restoration, and reconstruction in China.