Within the research project known as ‘Harbours from the Roman Period to Middle Ages’, an international conference titled “Harbours as objects of interdisciplinary research – Archaeology + History + Geosciences” was held in Kiel in 2015. This volume includes 26 papers presented at the conference under the headings ‘Geophysics and Field Research: Developing methods’, ‘Geoarchaeology: Changing Harbour Environments’, ‘Archaeological Features: Harbour Facilities and Infrastructure’ and ‘Written and Iconographic Sources: Complementing the Material Evidence’.