Endorsed by the UN Decade of Ocean Science for Sustainable Development (2021-2030), the Digital Twins of the Ocean (DITTO) programme was launched in 2021. The vision of the DITTO Programme is to build a world where Digital Twins of the Ocean are used to support ocean protection, ocean governance, and a sustainable blue economy. The DITTO Summit 2022 was held in London and was attended by 500+ participants physically and virtually exploring progress in the development of DITTO capability, considering their requirements for infrastructure, describing potential applications, and defining a path forward. Taking the great arena of 2023 World Ocean Week in Xiamen, the DITTO Summit 2023 will be co-organised by the Fujian Ocean Innovation Center and State Key Laboratory of Marine Environmental Science (Xiamen University), to gather global participants with the themes focusing on sharing the latest knowledge about DTOs and discussing future actions on advancing and applying them. We now warmly welcome and encourage everyone who is interested in the topic of DTOs to register for communication, exchange, and collaboration.