Rice husk is a by-product of the rice milling process. About one hundred million tons of rice husks are produced annually worldwide. To reduce the waste volume, rice husk is burned as fuel in rice drying ovens, the combustion effect evaporates the organic compounds and water of the rice husk, leaving about 20% of the mass as rice husk ash. Rice husk ash has a pozzolanic effect and can be used as an additive in concrete. In addition, the improvement of soils with the addition of rice husk ash and lime has been investigated in various studies. Consistency limits are the water content values​​ of cohesive soils where behavior changes from liquid to plastic or plastic to solid. These values​​ significantly affect the mechanical behavior of soils. In this study, the consistency limits of soils improved with rice husk ash, an organic pozzolanic waste product, were investigated by laboratory studies.