The transportation sector is responsible for 20% of world primary energy use and 25% of energy related CO2 emissions. It is argued that there is a high potential to reduce energy related CO2 emissions from this sector by 30% from the 2012 level by 2050. Electric vehicles are considered to be the best option to decarbonize the transportation sector. The purpose of this thesis is to provide a better understanding of the supply risk factors of critical materials for electromobility. The method followed in this thesis is first to select critical materials that are essential for electromobility. Then, to identify relevant supply risk factors and describe the main drivers and indicators for each supply risk factor. Next the identified supply risk factors are applied to evaluate their impact on the availability of the selected critical materials. Data has been collected from secondary sources through literatures study. Eleven critical materials and six supply risk factors are studied in this thesis. The majority of the materials are found to be extracted as by-product materials and their availability could depend on the demand and extraction rate of the carrier metal. The reserve-to-production ratio showed that indium has the least number of years for the reserve to run out of economic extractable mineral. With regard to geographical concentration of ores and production, PGMs and REEs may face possibly high supply risk. Assessment of the environmental impacts has been limited by lack of data. The major end use application of each material and their future outlook is identified. The recycling rate is used as a simple indicator to evaluate the contribution of the recyclability of materials for their availability. The impact of supply risk factors of critical materials on electromobility could better be understood if all the supply risk factors identified in this thesis and the shortcomings of this thesis identified under each supply risk factors are addressed.