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Presently, seashell waste is a raw material that is easily available and is an attraction as a material to be recycled to replace materials in concrete mixes such as fine aggregates, coarse aggregates and cement. Previous study found that the seashell waste has demonstrated properties that will help to increase the strength of concrete if added as aggregate as the strength closely equal with aggregate. Other than that, the content of calcium carbonate that can be produced from the shell can contribute to the overall strength of concrete mixture. Moreover, the depletion of natural resources such as aggregate in construction due to the high demand has been stressing which led to more environment friendly usage of material for construction. Therefore, this paper explores the mechanical and physical properties of seashell waste as a partial replacement for fine aggregate. About 36 cube samples, 18 prism samples and 15 control samples were casted in concrete grade M30 with the replacement percentage of 60%, 70%, 80% seashell as fine aggregate. The outcome shows that highest strength for compressive strength and flexural strength test on 70% of replacement seashell as fine aggregate in concrete. [ABSTRACT FROM AUTHOR]