This study is an attempt to desulfurize organic sulfur from coal samples with potassium ferric hexacyanoferrate (II), KFe[Fe(CN)6] and wheat straw ash, as the desulfurization agents. Effect of temperature, particle size and stirring time on desulfurization from the coal samples has been investigated. The temperature and stirring time are the most important parameters for the yield of desulfurization of organic sulfur. Removal of organic sulfur content increased continuously with increasing temperature from 298 to 368 K for potassium ferric hexacyanoferrate (II), and from 350 t0 600 K for wheat straw ash. The organic sulfur removal rate sharply increases from 10 min to 25 min stirring time. After 30 min it reaches a value of plateau. Particle size between -100 mesh and -200 mesh slightly affects on the amount of organic sulfur removal. Maximum removed sulfur values were 23.4% at 368 K for potassium ferric hexacyanoferrate (II) method and 38.2% at 600 K for wheat straw ash method. The wheat straw ash method was more effective than potassium ferric hexacyanoferrate (II) method.