In this study, nonionic surfactants were used in order to enhance the solubilization of sulfur compounds contained in the bunker-C oil. Tergitol series of nonionic surfactants were used and the solubilized sulfur contents were measured by X-ray sulfur spectrometer. It was found that the longer hydrocarbon chain length of surfactant in Tergitol series, the higher solubilizing capacity on bunker-C. The addition of cosurfactant such as alcohol increased the solubilization of sulfur compounds in the bunker-C, because cosurfactants in surfactant solution make the micelle packing more flexible.