Weak sandy soils present significant challenges for civil engineering construction because of their low bearing capacity and poor mechanical performance. Soil stabilization using cementitious additives has become an economical and practical alternative to soil replacement. This study evaluates the effectiveness of ordinary Portland cement and quicklime in improving the engineering properties of sandy soils collected from two locations in Ajdabiya City, northeastern Libya. Natural soil samples were treated with cement and lime at 5%, 10%, and 15% by dry weight. Laboratory testing included grain-size distribution, Standard Proctor compaction, direct shear, and unconfined compressive strength (UCS) tests. The untreated soils were classified as A-3 according to the AASHTO classification system and consisted predominantly of poorly graded fine sand with negligible fines. Experimental results demonstrated that cement stabilization significantly enhanced soil performance compared with lime treatment. Increasing cement content improved maximum dry density, shear strength, and compressive strength, with the greatest improvement observed at 15% cement. Lime treatment also improved the engineering behavior of the soils but produced lower strength gains than cement. The results indicate that cement stabilization provides an effective and economical technique for improving weak sandy soils in Ajdabiya and similar arid environments, thereby increasing bearing capacity and reducing settlement problems associated with shallow foundations................ Keywords:................ Soil stabilization; Cement; Lime; soil; Direct shear; Unconfined compressive strength; Ajdabiya; Libya.