An increasing number of incidents and hazards have caused huge loss of human life and property over the years, making it essential to improve our capabilities to handle natural and manmade emergencies. Efficient and effective use of online information helps to better prepare for, mitigate against, respond to and recover from various types of disasters and unexpected events. Consequently, the creation, management and use of online information have emerged as important areas of study in emergency management.The primary goal of this special issue of Online Information Review is to showcase the latest research related to the principles, strategies and practice of creating, managing and using online information in emergency management. The guest editors are seeking empirical, theoretical and high-quality innovative papers, both research-based and conceptual, helping us to unveil the value, impact and implications of online information in improving emergency management efforts.