This journal provides a medium for presentation and discussion of the latest developments in research, design, fabrication, transport/installation and in-service experiences relating to Marine Structures. The journal is focused on advancing knowledge specifically for Marine Structures that are constructed of steel, concrete, or new materials. This includes the classical areas of ships, fixed, mobile and floating offshore platforms, moorings, pipelines, cables, risers, subsea systems. New and emerging research topics of interest include wind turbines, wave energy converters, tidal turbines and offshore solar systems, aquaculture systems, underwater vehicles for shallow and deep ocean operations, inspection and maintenance related to marine structures, floating bridges and airports, submerged floating tunnels, and related machine learning applications. Marine Structures covers: Definition of the ocean environmental conditions; Loads exerted by waves, currents, wind, tides and ice; Seabed foundations, anchoring systems and interaction with marine structural systems; Evaluation of static and dynamic structural responses including collapse behaviour; Collision mechanics; Fatigue and fracture; Materials (and their selection), corrosion and other forms of degradation applied to marine structures; Formulation and application of design methods and criteria including system reliability analysis, and optimization techniques; Inspection, condition and structural health monitoring, repair/replacement and maintenance; Fabrication, transport, installation and decommissioning techniques; Methodology and practices for marine structure life-time extension; Resilient design of marine systems; Application of machine learning methods and data-driven models for strength and/or load/response predictions of marine structures