To provide a method for removing an organic sulfur compound, by which the organic sulfur compound can be removed from an organic compound containing the organic sulfur compound as an impurity in a high desulfurization efficiency by a simple process.

This method for removing the organic sulfur compound, characterized by adding an acetic acid/hydrogen peroxide mixture to an organic compound containing the organic sulfur compound as an impurity to oxidize the organic sulfur compound and then separating off the acetic acid/hydrogen peroxide mixture.