This volume constitutes the refereed and revised post-conference proceedings of the 4th IFIP TC 5 DCITDRR International Conference on Information Technology in Disaster Risk Reduction, ITDRR 2019, in Kyiv, Ukraine, in October 2019.The 17 full papers and 2 short papers presented were carefully reviewed and selected from 53 submissions.

Issues in the Use of the Recovery Watcher for Situation Awareness in Disaster and Inclusive Communications.- Information Technology Reengineering of the Electricity Generation System in Post-Disaster Recovery.- Information Technologies for Assessing the Impact of Climate Change and Natural Disasters in Socio-Economic Systems.- Problems of Cultural Heritage Preservation in the Context of the Armed Conflict Growth.- Proposal of Evacuation Support System and Evaluation by Multi-agent Simulation in a Regional Disaster.- Environmental Monitoring and Population Protection from Environmental Factors.- Ecological Internet Resource as a tool for Information Control of the Harmful Effects of Environmental Pollution.- Building Resilient Community by Public Private Partnership – From Science to Action in Developing Countries.- Building Resilient Community Through Plant Back Better Initiative – Guiding Principles and Best Practices.- An Earth Coordinate System for Earthquake Forecasting using SLHGN.- ImpactMap: A Collaborative Environment to Support Impact Projection of Complex Decision.- Ad-Hoc Architecture of Systems for Disaster Risk Management.- Conceptual Model of Debris Flow Information System.- Towards an Indoor Navigation Application for Emergency Evacuations and Persons with Visual Impairments – Experiences from First Responders and End Users.- Cyber Crisis Management Roles – a Municipality Responsibility Case Study.- Mathematical Model of Management of the Integral Risk of Emergency Situation on the Example of Fires.- 3D Simulation to Validate Autonomous Intervention Systems Architecture for Disaster Management.- Classification of Social Media Messages Posted at the Time of Disaster.- Workshop Program on Disaster Prevention and Mitigation for Young Generation Utilizing Disaster Information Tweeting and Mapping System.