This set of two volumes comprises the collection of the papers presented at the 5th International Conference on Maritime Technology and Engineering (MARTECH 2020) that was held in Lisbon, Portugal, from 16 to 19 November 2020. The Conference has evolved from the series of biennial national conferences in Portugal, which have become an international event, and which reflect the internationalization of the maritime sector and its activities. MARTECH 2020 is the fifth of this new series of biennial conferences.

The set comprises about 180 papers, which were fully reviewed by an International Scientific Committee. The contributions are organized in the following subject areas: Maritime transportation and ports Maritime traffic; Maritime Safety and Reliability, Ship Design; Design of Cruise Ships; Ship Structures (Ultimate Strength and Composites), Subsea Structures (Pipelines), Shipbuilding and Ship Repair; Ship Performance; Ship Hydrodynamics (CFD, Manoeuvring, Seakeeping, Moorings and Resistance)

Ship Machinery; Renewable Energies; Fishing and Aquaculture, Coastal structures, and Waves and currents.