The research aims to determine the nature of the relationship between demographic characteristics of citizens in the Republic of Serbia and their awareness of the police responsibilities in natural disasters caused by flooding. Taking into account all municipalities in Serbia in which there is a risk of flooding, nineteen were randomly selected. In selected municipalities 2,500 citizens were surveyed by using a multi-stage random sample in the areas and households that are more vulnerable in relation to the level of a hundred-year high water. The research results indicate that there is a statistically significant correlation between the demographic characteristics (gender, age, level of education and success in high school) and the awareness of citizens of the responsibilities of the police in natural disasters. Only 22% of respondents noted that they were informed on the police responsibilities in natural disasters. Awareness is the highest in respect of responsibilities of fire and rescue units in natural disasters caused by flooding and the citizens aged 48 to 58 years are best informed on the police responsibilities. Citizens with university degrees showed a higher level of awareness about the police responsibilities compared to the citizens with completed secondary four-year school. Also, there is a statistically significant difference in the results for men and women in terms of awareness. The research results can be used to proactively improve the awareness of citizens, bearing in mind the security implications for policing itself in such situations. Social and scientific justification of the research stems from the necessity of a comprehensive analysis of police work in natural disasters and its assessment by the citizens.