Although the scientific investigation into flood hazard assessment (FHA) has increased recently, a global analysis of FHA-related studies is still rare. This research aims to elucidate trends in FHA-related scientific inquiry from a quantitative perspective. A bibliometric analysis was conducted to analyze 723 articles published from 2000–2020 from the Web of Science databases (WoS). Bibliometrix R-Tool was used to explore the trends and themes in this field by analyzing substantial documents, sources, and authors. Results show a growing number of scientific publications during the past two decades and a poor collaboration network between countries in this field. Keyword analysis shows that the themes of this research domain were
focused on modeling. The main finding is that FHA remains an under-investigation field focusing on specific geographical areas. Nevertheless, international collaborations present an increasing trend in FHArelated research, and a growing number of scholars have significant interests in FHA, whose topics are gradually systematized. These findings offer a comprehensive picture of FHA-related research and suggest the need for and benefits of collaboration across geographical study areas.