Biomass resources might be recognized as a promising way to alter fossil fuels, such as petroleum oil, natural gas and coal and to prevent the emission of greenhouse gases which will bring about global warming. Therefore many countries have tried to identify and secure available biomass resources. In this study, the energy potential of Korean biomass resources, such as agricultural biomass wastes, municipal solid wastes, and livestock wastes, was analyzed and calculated by using various data. The available energy potential in 5 major cities in Korea was over 3.5 M TOE. Especially the municipal solid wastes was over 1.5 M TOE, so the conversion of municipal solid wastes might be easily adopted.