Abstract: The oyster shell usually which are disposed is used as an alternate for the cement, since, the shell is made up of calcium. This study reports the results of experiments evaluating the use of oyster shell powder from oyster production industry as partial replacement for ordinary Portland cement. Cement is partially replaced with oyster shell powder as 5, 10 and 15% by weight of cement. The compressive strength and flexural strength was determined at curing days of 7, 14 and 28 days.