To support flood mitigation management, flood damage reduction and saving human lives, and their critical infrastructures, a flood risk assessment and constructing a flood risk map are crucial. As frequent flooding events and urban water logging were observed at Sungai Pinang Watershed due to the urbanization development, and climate changes reported in the past, hence, in this work, physical flood hazard, vulnerability and risk of the critical infrastructures such as infrastructures and utilities, transportation, institution and public facilities, residential, commercial and industrial areas located at Sungai Pinang river basin, Malaysia were assessed and their maps were constructed which has not been reported. Initially, the flood hazard maps generated using a combination of 2D hydrodynamic models, Digital Elevation Model (DEM), and GIS base maps and with the results of the 2D hydraulic analysis, the flood depth was calculated. Thereafter, an integration of Geographic Information System (GIS) and Multi Criteria Decision Analysis (MCDA) namely Rank Sum and Analytical Hierarchical Process (AHP) were used to develop a Flood Vulnerability Index (FVI) map based on the results of the questioner surveys investigated from the professionals and government agencies panellists regarding the operational works prior, during and after the flood events. In order to construct the flood risk map, initially the flood damage of the critical infrastructures was estimated by multiplying the unit damage rates of each infrastructure for a range of flood return periods of 2200 year ARI by the relevant damage factors, then, the flood risk index was computed by multiplying the estimated flood damages by the probability of the flood occurrences. Each pixel of the flood risk map was produced by sum up the obtained flood risk indices and lastly, the estimated flood damage rates classified into the several flood risk degrees and colour coded to produce the flood risk map. The results obtained from the constructed flood hazard maps showed that flood hazard increased spatially and in magnitude with the rise of flood return periods and the results obtained from the developed critical physical infrastructure FVI maps demonstrated that the more vulnerable areas were mainly from the Infrastructures and Utilities category with the area of 0.531 km2 indicated as very high range of vulnerability with the index of 0.2488 while the least vulnerable areas were from the Industrial Areas category with the vulnerability index of 0.0768 and the area of 0.361 km2. It was concluded that the results of flood risk analysis were consistent with the past real flood events occurred and hit most of the critical infrastructures located in urban area of Sungai Penang basin in November 2017.