COST is an intergovernmental framework for European Cooperation in Science and Technology, allowing the coordination of nationally-funded research on a European level. Part of COST was COST Action C26 ‘Urban Habitat Constructions Under Catastrophic Events’, which started in 2006 and held its final conference in Naples, Italy, on 16-18 September 2010. The main objective of COST Action C26 was to increase the knowledge of the behaviour of constructions in urban habitat under catastrophic events (earthquakes, fire, wind, impact, explosions etc.), in order to predict their response when both the applied loading and the inherent structural resistance are combined in such a way that the safety level reaches unacceptable values, leading in some cases to a premature collapse. Urban Habitat Constructions Under Catastrophic Events collects 151 papers from internationally recognized outstanding experts from 46 countries that were presented at the final conference: 82 contributions from COST experts and 69 from external authors. They are subdivided into 5 sections, which exactly correspond to the 5 Chapters of the Final Report of the COST Action C26 activity: (I) Characterization of catastrophic actions on constructions; (II) Analysis of behaviour of constructions under catastrophic events; (III) Evaluation of vulnerability of constructions; (IV) Protecting, strengthening and repairing; (V) Strategy and guidelines for damage prevention. Urban Habitat Constructions Under Catastrophic Events will be of interest to academics and engineers in civil and structural engineering, especially those involved in fire resistance, earthquake resistance, impact and explosion resistance, and resistance to Infrequent Loading Conditions.