Huge quantity of saw dust is being generated worldwide due to the rapid urbanization. The disposal of saw dust in open areas or landfills is not an environment friendly solution. Utilization of saw dust in geotechnical applications is likely provides a better solution. This study investigates effect of sawdust addition on atterberg limits of the Soil-Bentonite mixture. A series of tests were performed on bentonite with 1%, 2%,…, 6% sawdust contents. The results showed that application of sawdust reduced liquid limit and plastic limit and increased plasticity index of highly expansive bentonite.