Flood hazards are the most common and destructive of all natural disasters. For decades, experts have been examining how flood losses can be mitigated. Just as in other risk domains, the study of risk perception and risk communication has gained increasing interest in flood risk management. Because of this research growth, a review of the state of the art in this domain is believed necessary. The review comprises 57 empirically based peer-reviewed articles on flood risk perception and communication from the Web of Science and Scopus databases. The characteristics of these articles are listed in a comprehensive table, presenting research design, research variables, and key findings. From this review, it follows that the majority of studies are of exploratory nature and have not applied any of the theoretical frameworks that are available in social science research. Consequently, a methodological standardization in measuring and analyzing people's flood risk perceptions and their adaptive behaviors is hardly present. This heterogeneity leads to difficulties in comparing results among studies. It is also shown that theoretical and empirical studies on flood risk communication are nearly nonexistent. The paper concludes with a summary on methodological issues in the fields of flood-risk perception and flood-risk communication and proposes an agenda for future research. Key words flood risk, risk perception, risk communication, literature review 3 1 I NT R O D UC T I O N Flood hazards are a serious threat to the economic and social structures of our society. Each year, floods claim approximately 20,000 lives and adversely affect at least 20 million people worldwide, mostly because of the homelessness resulting from flood events. (cf. 1) Recent studies have indicated that losses from flood hazards are expected to increase in coming years. This prognosis is mainly based on the predicted impacts of climate change. (2) In many countries, however, flood vulnerability is also expected to increase as a consequence of population growth and spatial expansion. (3) Around the world, flood-risk experts and decision makers face the challenge of finding techniques and measures to effectively cope with these hazards. In order to assess the negative impact of flood hazards, experts have gradually adopted a risk-based approach that focuses on the probability of events and the magnitude of negative consequences. (4) While this technical approach deals with "objective" risk assessment, a substantial group of researchers have concentrated on the "subjective" aspects of flood risk, which determine people's risk perception. Several researchers recognize that flood-risk management is shifting from a primarily objective approach to an integrated approach with attention to social aspects such as improving flood preparedness and response. (5,6) As such, the need to integrate lay knowledge into measures to prevent, mitigate, and deal with risk is a relatively new field of research. (7) Risk communication is becoming increasingly promulgated as...