The SmartShip project capitalizes on available COTS technologies and limited RTD, and delivers an ICT & IoT-enabled holistic cloud-based maritime performance & monitoring system, for the entire lifecycle of a ship, by optimizing energy efficiency, emissions reduction, fuel consumption, and in parallel includes circular economy concepts in the maritime field. SmartShip is motivated by the necessity of bringing together Information and Communication Technologies (ICT) of focused Universities, Research Institutions and Companies from the maritime sector. SmartShip introduces a holistic integrated ICT-based framework for the sustainable, individualized and completely automated energy management of ships, offering a multi-layer optimization in the fields of fuel consumption, energy efficiency and emissions control, in full respect to the implementation of the requirements of maritime regulations (Annex VI of the IMO MARPOL Convention and of Directive 2012/33/EU). The Specific objectives of the SmartShip project were fully met: 1. Marine market needs in energy efficiency and emissions control in parallel with end users’ requirements, towards the definition of accurate, industry-driven case scenarios were accurately described 2. Knowledge exchange between academic and non-academic experts was fostered 3. A Data Analytics and a Decision Support Tool were developed which compile data from existing sensing devices in vessels, manage the operation of the whole IoT environment, and run optimization algorithms to provide suggestions related to the operation of the ship 4. Existing infrastructure in ships and the technologies investigated and developed in Objective #2 were fully exploited in order to enhance the implementation of Circular Economy in the maritime field, in terms of management of engines’ components 5. A holistic framework for energy efficiency and emissions control in maritime through the implementation and validation of new tools (see objectives #3) was offered and integrated with the existing ones (objective #2), for optimizing the efficiency of daily operations 6. The system's effectiveness based on real-life use cases towards the reinforcement of the European Maritime Industry was demonstrated 7. New long-lasting research collaborations were developed and the transfer of knowledge between participating organizations was achieved while an improved research and innovation potential, through the development of training material towards long-term sustainability and exploitation, was fostered