A variety of flood vulnerability assessments have been carried out in many previous studies to prioritize flood damage mitigation plans. However, domestic and foreign studies have not analyzed the influence of vulnerability assessment components in different methods for determining flood vulnerability outcomes. Therefore, this study investigated the differences in flood vulnerability results for the 54 administrative districts in the Nakdong Watershed that implemented widely used methods, such as the OECD PSR, IPCC concept, and MOLIT PFD. It was found that the three analysis methods could result in very different flood vulnerability index outcomes in a considerable number of districts. This case study on flood vulnerability outcomes of different assessment methods can help to select a proper method for assessment purposes. Keywords: Flood Vulnerability Assessment, OECD PSR, IPCC Concept, MOLIT PFD