Enzyme based liquid soil stabilizers have emerged as an alternative soil stabilization techniquernand are being introduced to the road construction industry, with an objective to improve therngeotechnical properties of soils and ultimately reduce the overall cost of the projects. However,rnevidence to support the effectiveness of these products as stabilizer is based on manufacturerâ€™srnclaims in their marketing brochures and manuals. Thus there is a need for an independentrnassessment of these products. Accordingly, this study is performed to evaluate the effect ofrnTerraZyme which is an Enzyme based liquid stabilizer in improving the engineering propertiesrnof a red clay soil.rnSoil samples were collected from five different location in the northern part of Addis Ababa, andrndifferent laboratory tests were conducted on the soil samples with and without the application ofrnTerraZyme. These tests include Particle Size Distribution, Plasticity Index, CBR andrnUnconfined Compressive Strength tests.rnThe result obtained shows a slight increment in the UCS and CBR tests of the soil but thernimprovement is very small to warrant a large scale application of TerraZyme for red clay soil.rnTherefore, the type of soils in which the TerraZyme application can produce an optimal resultrnshould be investigated before applying TerraZyme on a large scale projects.