This thesis abstract explores the utilization of soil as a readily available and abundant resource for various applications, including cost-effective alternatives to traditional construction materials. While soil can be found everywhere, the production of bricks typically requires the use of red clay soil due to its favorable geotechnical properties. However, the availability of clay soil is limited, leading to high costs. Previous studies have attempted to use non-clay soil for brick production by incorporating stabilizers such as lime. Nevertheless, there is a lack of research investigating the behavior and application of stabilized soil using maize cob ash for the production of earthen bricks. The primary objective of this research is to examine the geotechnical characteristics of soil and determine the optimal proportions of soil and crop ash stabilizers for the production of earthen bricks. Soil samples collected around Bahir Dar City were classified as A-7-5 according to AASHTO, with test pit-1 and test pit-2 soils classified as CH, and test pit-3 as MH based on the USCS test. Different test pit materials were used to assess the effectiveness of maize cob ash as a stabilizer. To evaluate the geotechnical properties of the soils, tests were conducted to measure moisture content, Atterberg limits, specific gravity, and compaction. The natural soil was then stabilized with various percentages of maize cob ash (2%, 4%, 6%, 8%, 10%, 12%, and 14% by dry weight) to produce construction materials for bricks. The compressive strength test was employed to determine the optimal percentage composition of the stabilized material and natural soils. The test results revealed compressive strengths of 4.1, 4.4, 8.5, 13.2, 17.7, 20.6, 23.3, and 23.0 MPa for the different compositions, indicating the effectiveness of the stabilization process. Keywords: Stabilizer, Maize Cob, Clay soil, Brick,characteristics.